And that's the killer feature! Librem/Pine have managed to build a community around their hardware. In theory, I could buy a Meizu phone and pick up its PostMarket OS port at the point where the last guy who tried it gave up. But trying to do it without a community would be no fun at all, and finding answers once you run into a roadblock will be an uphill battle. For instance, one of Meizu's kernel repositories has an unanswered issue from a few years ago, asking if they can release more up-to-date kernel code.
You're just focusing on the hardware's specs, but the community is what gives Librem/Pine's hardware its value.