I would have tried to use stock, too, if I had bought a phone that would have come with stock. But as it was, it came with Lineage, and I'm glad it did...
At least in case of the Pro1 X, I guess Lineage is going to be the new stock, anyway. No need to modify your phone, you'll get it preinstalled. And no matter how much better the Pro1 X stock Android might turn out compared to the Pro1, Lineage will probably be better, and it will probably support the specifics of the phone better, because that's where the developers are said to be working now. I guess they just wouldn't have the same op