In 2012 un-upvote of a comment was implemented Cancelling upvote on comment?, but with serious restrictions:

Comment upvotes can only be undone for a short time and while you did not navigate away from the page. Once you undo the upvote, you cannot upvote the same comment again.
From Cancelling upvote on comment?

As a reason it was said “We do not want flip flopping, nor do we want people to un-upvote stuff from the past. The only use case is undoing a mis-click.”

It is not clear why “we want” such way. There are multiple comments to the answer and Comment upvote, undo, and then re-upvote: why not?, describing different scenarios that will benefit from giving user ability to upvote and revert when user needs.

I didn’t noticed any comment explaining what harm would be if user changed the vote to the comment more than once.

The answers to questions Why is re-upvoting not allowed for comments? and Comment upvote, undo, and then re-upvote: why not? also do not explain the reason, they refers to original implementation answer and require user to “have to take a very concious decision to un-upvote” (within 1 minute)

I had a few times, that after comment’s upvote, I start to think, was it correct or not, and having time pressure(to decide within 1 minute), I made wrong decision, that later I wasn’t happy about.

Please remove restrictions on un-upvote and re-upvote and allow users to express their opinion any time.
Changing the mind over the time is in a human nature and should not be prohibited.

Update: Thanks to Magisch’s comment for explaining one of the reasons for downvotes. I am aware that comments are considered second class citizens, but they are not temporary. “They don't. They stay around.“ If the comments and comment votes are not important for site, why site developers implemented some complex logic to restrict the votes on comments? Give users more control, in particular if it doesn’t cause any harm.
Comments are content; votes on comments are content as well.” and if users have an option to upvote the comment, they should have an ability to change the vote, when they change their opinion.

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    If you downvote, please leave a comment explaining what you don’t like. – Michael Freidgeim Nov 20 '18 at 13:45
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    At least make it consistent with how voting on posts work (even if that's not ideal either). – Dukeling Nov 20 '18 at 13:57
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    Downvotes do not require comments. Asking for such comments only attract more downvotes. – fbueckert Nov 20 '18 at 14:12
  • @fbueckert, what is wrong if I want to understand, what people do not like in my Feature-Request? Are you telling, that people will vote not for/against my suggestion, but because I asked to leave a comment? – Michael Freidgeim Nov 20 '18 at 14:41
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    No, I'm saying that downvotes are, "I disagree with this feature request", which you seem to understand. By adding a comment that says downvoters should comment, you are trying to stifle dissension to your idea. That's bad faith. I don't see you requesting upvoters to explain why they like it. Some users might be on the fence, but evidence of bad faith towards those that disagree will tip others over the line into disagreeing. – fbueckert Nov 20 '18 at 14:43
  • Yes, asking people to explain their downvotes may make people more negative and critical, and thus more inclined to downvote. – Dukeling Nov 20 '18 at 14:49
  • Seems utterly inconsequential to me. Comments are already temporary, comment upvotes mean even less. – Magisch Nov 20 '18 at 14:59
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    I just upvoted fbueckert last comment, after already upvoting 1st comment by poster - now I want to remove my upvote of that first comment, now that I've changed my mind from reading fbueckert last comment - but its too late, I can't :( – cellepo Nov 21 '18 at 3:11
  • Dukeling's suggestion on "make it consistent with post voting" is fair, but votes on posts are also locked after a few minutes, and can only be unlocked after edited. The difference is, posts can always be edited at any times while comments can only be edited in the first 5 minutes. – Meta Andrew T. Nov 21 '18 at 10:36
  • @fbueckert, I am surprised with your interpretation of asking for explanation as bad faith. According to meta.stackoverflow.com/questions/252826/… , majority consider asking downvoters for comments is appropriate, and on main sites (not on meta, as I know) it’s encouraged – Michael Freidgeim Nov 26 '18 at 6:05

Per my understanding, Stac Echange is a serious place. Users are encouraged, or sometimes required, to think twice before they act. This is the reason for many restrictions, including this limitation on un-voting and re-voting comments. Similarly, one cannot cancel their up/down vote on posts after 5 minutes, unless they're edited.

If you want to repeatedly vote/un-vote a comment, maybe you should ask yourself "why am I repeating this?", "do I really need to repeat this?", and think thrice before you submit your vote. This is not a game.

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    Links in my suggestion provide multiple reasons, why people want to change their vote, e.g. they learn more or subsequent comments convinced them that initial view was wrong. Or I came to the same page 3 years later and my opinion changed during this period. Restrictions on questions/ answers has some reasoning about preventing reputation games(see separate discussions about them, e.g see meta.stackexchange.com/questions/70853/…). Comments are not associated with reputation, so they do not have any excuse for restrictions – Michael Freidgeim Nov 26 '18 at 6:19

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