Why does every AI vocalist sound like the same person?

Been thinking about this a lot and I don't really have an answer.

A big part of why we love certain artists isn't even the songs themselves, it's them. MJ's voice is unmistakable. The Weeknd has that sound you recognize in three seconds. Justin Bieber at his peak had a tone that made teenage girls worldwide lose their minds. The voice IS the brand.

So here's my problem with AI music right now, even on V5.5:

No vocal identity. Every generated singer sounds vaguely competent but completely anonymous. Like, the melody slaps, the production is solid, but who is singing this? Nobody. Everybody. A ghost.

The ceiling is weirdly low on expressiveness. Real vocalists do things with their voice, cracks, runs, breath control, that slightly-off-pitch thing that somehow makes it more emotional. AI vocals just... don't have that. They're technically fine and somehow totally flat at the same time.

No consistency across generations. Even if one generation sounds decent, the next song has a completely different "voice." There's no persistent vocal persona you can build on.

I've seen some platforms roll out voice cloning, like train it on your own voice and have it sing your stuff. That seems like it could fix the consistency problem at least. But does it actually work well enough to matter? And what about people who just want a distinctive AI vocalist that isn't their own voice?

Curious how others are working around this. Is there a workflow that actually gets you somewhere closer to a real vocal identity, or are we just kind of stuck here?