It would be more sensible to remember the reading of 々 as くりかえし, since there is already the vocab: 繰り返す.
For 乃 as ない, I think it would be more OK to also teach the associated vocab 乃至（ないし）. Learning a Kanji for the sake of a single vocab is OK, I think – like 嫉妬、匂い、喉、挨拶… (Well, these are ones not included in WaniKani, even though they are common enough vocabs.)
Hmm. Interesting. Well I guess I’m glad I took a year off. I hope things are added and updated and made even better by the time I reach the higher levels. If I hadn’t reset or took time off, I’d probably be level 60 by now. (Maybe? Idk. I can’t math.)
Edit: Not that things are bad now, just that I hope they’ll be even better and more accurate and useful and thorough and stuffs by the time I get there?
Will the people who have already learned it with the less common reading get a chance/prompt to learn it again?
Well, yeah. That’s why I knew that reading.
I think learning obscure kanji is like (college analogy) learning how to work out trig proofs while taking a programming major or (random analogy) taking surfing lessons in North Dakota. If you ever need to use them, you’ll know how, but you probably shouldn’t expect to use it.
Or, to look at it another way, it’s like all the complicated wording that only lawyers use on a regular basis. You can look up any of the words in a dictionary, and there are other ways to write/say them.
Hope this helps. Probably doesn’t, but I typed all this up and I’m posting it so do what you will.
Once the names are added people at the right levels will get them added to their queue (similar to how it works when we add vocabulary) but I don’t think there is a way to re-add the related kanji back into the lesson queue. When I do the update I will make a post with all of the changed info though. Hopefully that will help. And the names will be teaching the readings too, of course.