Yeah... keep in mind how they're made:
Company A makes a chip, which may be public, or under NDA in which case whatever extracts we get from it are probably partial and badly written/formatted.
Company B uses chip (under license if applicable), to make LCD panels -- the chip is bonded to glass or flex, all the TFT stuff is deposited on the glass and wired up, and that's a module.
Finally, Company C uses the finished panel, maybe with an additional interface board or flex, or controllers, puts it on a board or module, puts up programming info, etc., and that winds up on suppliers like Digi-Key. That includes touch controllers, or more powerful graphics controllers that add a framebuffer or what have you. Or ancillary stuff like backlight controller/power converter.
Panel manufacturers are all over the place, product lifetimes are often short, a few years -- so it often takes a 3rd layer to stabilize that and offer something for low quantity / long life customers. Which is how you have a $5 panel costing like $50 or something from Newhaven or etc.
And companies A and B could be Taiwanese or Chinese, so their datasheets are incomprehensible for most of us, unless translated; and it might be a poor translation. Hopefully, Company C smooths over that sort of compatibility issue as well; but, well, it seems not always to be the case.
Tim