From what I understand, the RISC-V ecosystem is not polished enough yet, so the state of PineTab-V roughly represents the state of the entire platform for desktop Linux.
As much as I like the idea behind Pine64, make sure you understand what you're doing - their devices usually need some time before they're useful, they might underperform, etc.
On the other hand, they're usually priced well for what they offer, and I think the ARM model of new PineTab might look better than their usual new offerings. Make sure to find out, how polished it is before you buy.