I understand that there is an upper limit. But why do you have to type at least 15 characters to post a comment?
It is easy to work around it anyway (like adding dots or other useless things).
I find it .... errr ... well ... amusing, ridiculous, surprising, interesting and all kinds of other things, that a large percentage of the honorable meta crowd really thinks that a minimum character limit encourages "thoughtful comments". Since when are people that talk more more thoughtful? Since when are long texts more thoughtful? Since when haven't you been talking to your marketing department? Since when is more code better code?
And, best of all, IMHO: Since when is saying "Thank you!" considered a thoughtless venture into AOL land?
The types of questions asked on SO tend not to be yes/no types of questions and generally require a bit of explanation. Answers are, on average, a few sentences at least, and responders seem to enjoy posting thorough and detailed answers.
That said, I suppose there's no reason to impose a minimum on trusted users with high enough rep.
I'm for lowering this limit too. It's silly to put in "Comment ." just to get it posted. Didn't it used to be 10? Can't we get 10 at least?
Preventing mistakes is a non-argument. It only stops accidental posting if you post 14 characters or less and if you've done that well it's easy enough to copy and paste into a new comment and delete the old one.
One of the most nonsense things that come with the limit is when you reply to someone.
If someone points out a problem in my answer, if they have a long name a comment like:
@IHaveAReallyLongName fixed Is a legitimate comment, but on the other end:
@short fixed is not legitimate. It makes no sense that who i'm replying to should require shorter or longer comments.
I got sick of the umpteen bajillion "bugs" opened on this, so we "fixed the bug".
This is now less easy to bypass; perhaps one should consider populating their comment with something meaningful of 15 characters or more? Perhaps if one has less to say than that, one should keep one's thoughts to him or herself?
A modest proposal.