So there's also two separate things in tension here, where on the one hand there's the idea that yes, a transformation-focused game should have transformation feel meaningful and important. On the other hand, though, I think a major part of CoC's success came from being a very flexible furry self-insert character creator. The ability to design your ideal body down to a fairly deep level of detail is a large part of the appeal, and while it would be ideal to both have that and make that ideal form be something with weight and meaning, I don't realistically think that any of these games can have both.
That's not to say that there can't be some amount of fixing this: I think it would not be especially hard for Anno and Syri's content to acknowledge an ausar or ausar-adjacent Steele to a much greater degree than it currently does, for instance, and similarly I think most zaika content should have been written to acknowledge a zaika Steele. But having every character acknowledge every possible shape of the PC would by necessity require greatly paring down the player's options, by which I mean such a game could support maybe at most five species, and a large percentage of the player base would not be okay with that. I know I would find it stifling.