iOS is probably the worst choice if you want to sideload apps. I would recommend sticking with Android and run your Samsung into the ground (maybe flash a custom ROM?) before getting something like a Fairphone.
Besides, what do you want to be “passionate” about in mobile phones? To me, they’re just tools for browsing the web, playing games, and staying in contact with friends and family while on the go; anything extra is superficial.
Fun fact, BG3 only has a max of 4 body types per race, and the lower genitalia each have their own models to fit each body type, and that’s just for the “normal” sized races. The short races also have their body types, and so does the Dragonborn. Each armour and clothing piece has to have one unique model and rig to fit each of those body types; that’s a lot of modeling and rigging work.
Now how much gear is there in Runescape?