I guess none of us like to see questions where the OP disappears once the problem has been resolved, without leaving any clues as to what exactly worked to solve the problem.
For this reason, I tend to believe the quality bar for an OP answering their own question should be lower than the bar for other posts. We want to encourage the OP to enter their own answer, if the problem got resolved and none of the other provided answers in themselves can be accepted by the OP.
I often see such answers showing up in the low quality review queue. I tend to answer Looks OK
as long as I believe that somebody in the future facing the same symptoms will be able to use the answer to figure out if they are in fact facing the same problem as the OP and that the answer will at least provide a hint as to what can be attempted.
I do hope that when somebody else find the answer to be useful despite being lower quality, they will edit the answer to become better.
There still has to be a bar though. The OP could answer in a way, that is too poor to be helpful. And I think this answer is one such example.
Does others agree that the quality bar for the OP answering their own question should be lower than the bar for other posts? Any suggestions on what criteria could be used to better decide if such an answer meets the bar?