A suggestion for you: Microsoft and Qualcomm are working on ARM based laptops with impressive numbers right now. I believe in a year after those are released you’ll see tablets using the same CPUs that will be way better to run Linux than the garbage we’ve available today.
The issue with most ARM / Android tablets right now is that besides having locked bootloaders (so much bitching about Apple and then they do the same) they don’t have an UEFI and that means the OS needs to be responsible for the low level shenanigans of booting the systems, initializing the hardware etc. making it so you’ve to create a tweaked kernel for each device. It isn’t feasible to support so much hardware thus there’s little to no Linux support on those devices.
Whatever is coming from Qualcomm right now will feature an UEFI and will be a more open platform like a generic x86 computer and we’ll get Linux support really fast.