I had the same problem until I installed the nvidia drivers. KDE will install some that gets things to work but I had that sleeping problem you mention. I can’t remember the exact package name but I can try and figure it out if you need help finding it.

Because if google kills side loading on all non custom os devices, that removes the incentive for open source developers to make software if there is no way to distribute it. So even custom OS’s will feel this unfortunately. We might still have viable options, but nothing like we see today.

My gf has an xppen tablet and loves it. But it runs android. I haven’t looked into if I can easily install an alternative os.