@Fubarberry I've started playing Cities:Skylines (the original one) again, and downloaded multiple mods from the Steam Workshop. It froze one day and I couldn't fix it in any way than to shut down my Deck. Every upgrades I did to that city were just gone.
Thankfully I managed to improve my public transit by adding more lines, more buses and changing some routes, as well as adding a few more metro stations as infill (sadly I have to redo all the metro lines all the time when I do this).
I play vanilla for now, as I want to make the most out of it without DLCs first. Then I think I will get the snowfall DLC in order to get trams going (as a European I don't understand why are trams, and partly even trolleybuses, hidden under DLCs but metros aren't, as in my country almost all larger cities have trams, yet only the biggest has a metro. But I digress).