They're all using the same junk SoC's with zero documentation and the crappiest possible level of "board" support anyway. You're actually better off buying a device where that support has been properly reverse-engineered/forward ported and is included in the mainline kernel. (Lots of Allwinner boards are "supported" in that way.) But it's ridiculous that we have to do this.

Also FWIW, the problem has zilch to do with "Android" per se - pre-Android mobile Linux was even worse. It's embedded platforms in general.