"PC" hardware is very standardised. The vast majority of one "PC" is very, very compatible with every other "PC". The exception is individual expansion hardwares, which need new drivers (firmware) when they are introduced. What helps is that most hardware developers write drivers for Windows. Many even publish how to write drivers. A good example of an exception is Nvidia. Windows is the only operating system that Nvidia wants to work with their hardware.
In general, hardware that Pine64 uses, is not Windows-compatible. So we rely on manufacturer's specs, or reverse engineering, to make it work. That's why it takes time to get these things working.
I'm not savvy to the particulars of the PineTab itself. It may be quite similar to the Pinebook (not Pinebook Pro). But it may not. If operating systems that run on the Pinebook all run unmodified on the PineTab, then they are similar. But probably not. PineTab might have more in common with PinePhone, which also I don't know too much about. Hopefully someone with more specific knowledge of these products can comment.
In general, hardware that Pine64 uses, is not Windows-compatible. So we rely on manufacturer's specs, or reverse engineering, to make it work. That's why it takes time to get these things working.
I'm not savvy to the particulars of the PineTab itself. It may be quite similar to the Pinebook (not Pinebook Pro). But it may not. If operating systems that run on the Pinebook all run unmodified on the PineTab, then they are similar. But probably not. PineTab might have more in common with PinePhone, which also I don't know too much about. Hopefully someone with more specific knowledge of these products can comment.