So, Beto is very much a liberal, in the mainstream of the Dem party, like you said. He's probably marginally more conservative when it comes to actual votes than someone like Harris, and a decent amount more conservative rhetorically, because, well, he's from Texas. His language is always touched with a bit of Obama-esque bipartisanship fetishism.
I'm just talking about his actual ability to win a primary, where I struggle to see his path. Like you said, Bernie people are scared of him, because they see Obama all over again, swooning for style while missing that there's no leftism to the substance. And maybe that charisma will be enough to win over enough of the less plugged-in Bernie supporters that the protestations of the hardcore won't matter. But if he's pulling neither votes from the Bernie left, nor from black constituencies, what's his base? If it's just non-leftist white Dems, he probably comes second to Kamala, maybe third to her and Bernie. Maybe if he could get a surge of new Hispanic participation in the primaries, but his results in Texas suggest he doesn't actually have an above-average amount of pull among Latinos to do that.