That's an interesting mechanic for sure! Not sure which ID I'd bring for Sinclair in a full Sinking team, though... I mean, I could bring back the mariachi but is it really worth it...?
They're not really shy about releasing E.G.O with no good IDs to go along with it.
It'll probably become less of an issue once every character has a decent ID to fill a niche, but for now while the game and meta is still developing it might be rough.
From what I saw, people are very mad about it but I honestly don't see the big issue. Hong Lu will get a tremor ID eventually, Sinclair will get a sinking ID eventually, and until then you're free not to pull/spark Cavernous Wailing.