Maybe it's worth teaching 玉 as radical

[DjCoco]

I know right now there’s only two kanji on WaniKani that would incorporate it, but the mnemonic for 璧 right now is just stupid.

璧 means “disc” and I think knowing that 玉 means “ball”, it would make much more sense to build a mnemonic around that (since a disc is pretty much a 2D ball), instead of talking about getting a drop from a king.

[PotatoDancer]

This isn’t exactly an answer to your question but:

@koichi

This is something I want to do — because you’re right, it’s a bit weird. Some pretty legacy system things we built that need to be pulled apart in order for us to do something like this. But yeah, it’s not just kanji as radicals, but it’s also things like radicals that are the same as kanji you learned previously — I mean, maybe you ought to learn them still, but they should really just burn after a couple turns in your Reviews, probably (I think we’re closer to being able to do this over the other one, actually).

from Why doesn't Wanikani treat all kanji as radicals? - #10 by koichi basically agrees with you - kanji should be radicals more often than they are now. But legacy code means that it would require rewriting things which is a lot of effort and I don’t even work at wanikani anyway so who knows when that will actually happen?

[brenty]

Regardless of legacy code, just the relationships themselves…that would require a lot of rethinking and shifting things around. Could be a fun project though.