After I manage to make it work 100% for what I primarily need I hope that I'll also get (slowly) to use it as cloud storage and maybe Bitcoin node + Electrum server, but for that I'll have to learn what HDD I need and how to link it to the Pi. (For media I have an old NAS that still does the job fine.)
But I'm far from all this.
So the only good thing is that I'll get more used to Linux systems... and maybe with some luck it will work as RetroPi
As an update: the printer needed a visit to the service, also I needed a better tutorial on how to use it from Windows. Now Pi works just fine as print server.
As scanner I didn't invest yet more time in making it work, but I hope that I'll do that too someday.
I've tested RetroPi, but I was not impressed. I've struggled a lot with the controller setup, I made some of the games work, but I still couldn't make the PS3 controller get recognized in the ZXSpectrum games (and I miss Chuckie Egg, River Raid, Sai Combat...)
My overall sentiment on the Pi now is that it can be made to work as desired, but it's hard to configure and since I don't have Nix background I may not search for info in the right places and I may lack the availability to get and compile this and that 100 times until I find the one that works.
Thank you all for the help/inputs. I'll lock the thread now.