Alright. That is much stuff to read through. Thanks for your help.
Two questions I have already, is the preinstalled OS useable for a rather casual user and does the workaround with the WI-FI dongles works as easy as just picking the right one and plugging it in?

Like I wrote, I need a new tablet for my everyday use. Data management, writing stuff and maybe some coding on the off chance that I need to for a private project (which is very unlikely).
I used Linux Mint on my last Netbook which was seven or eight years ago but never on a touch device.

Ok. Patching my own drives sounds like a little bit much for me. Could I find templates for that online or is this so much dependent on the particular hardware that it is like a case by case solution.

What kind of work do you mean?