The tags I wanted to add were the ones user_2 mentions:
I know that there probably won't be a ton of questions with these tags, but I still think they are relevant to the question and on-topic. And I can't see how those tags could be any more general, except
[Power-distribution] which really doesn't say anything about what the question is about except "not electronics".
I believe that possible new users (myself included) might want to use those tags in the future. I'm quite certain the person posting the question wanted to add those tags, but couldn't due to low rep. For the moment, the only relevant tags that can be used by power system engineers (utility scale) are:
[power-outage] should probably be synonyms as they basically mean the same thing, but I don't know exactly how that works.
I know that this site contains mostly questions about electronics, but according to this meta post, power system questions are on topic.
I would understand if my edit was rejected as too minor, but that was not the case. (The first rejection reason is in my opinion plain wrong, but probably the user didn't consider it a good edit and just picked a random reason to avoid wasting time. The main reason for suggesting the edit was actually to create the tags for future new users, and write tag wikis.
Any views on this topic? Am I wrong?