I think self-answering is a behavior to be encouraged even, and especially, when a question has gone unanswered for a long time.
If long unanswered questions are not revived by anyone providing an answer then they remain unanswered. I think a belated useful (upvoted) self-answer should be rewarded by the same badge that would be issued if any other user had ...
Generally speaking, the badges you can't earn with a self-answer are the ones depending partially on actions you fully control. Examples:
Depending on accepting the answer:
Tenacious / Unsung Hero
Depending on editing the question - if you have <2k reputation, that's not automatic:
Explainer / Refiner / Illuminator
FWIW: I am just one more relatively low-rep user who holds both of the badges: Peer Pressure on SO and Disciplined on SO. I realize that this is an opinion of N = 1 person, but I do not have the skills needed to assess the effects of these badge award systems for N > 1. I think that the badges benefited me personally, and made me improve my posting ...
Well, I was going to ask my own question, with respect to an ongoing discussion on this in chat, but I think it works just as well as an answer.
I guess the direction SE's taken has been to try to be 'kinder and gentler' towards new users. I don't want a scarlet letter P hanging around 'cause I was a newbie, and asked a question people felt was necessary to ...
The mobile version of SE is not being developed by the developers anymore. So switch to the responsive version, click the "full site" button on the bottom of the page.
There are plenty of bugs about the mobile-web. Even on the tag description it mentions:
For questions about the (now deprecated) mobile versions of Stack Exchange sites.
I noticed this too. The solution is to go to the home page of the site, then tap on "full site" at the bottom. Since I have only seen this happen when viewing the new profile page with the old mobile site active, I doubt it will be fixed as the old mobile site is in the process of being removed.
The wording suggests that the order doesn't matter (I certainly thought so), but the order as it turns out, matters.
The order does not matter, not for the badge counter and not for the SEDE query (it has an abs on the last line). Of course, if your edit is more than twelve hours before the answer, then it does not count. And tag-only edits to the question ...