I have bought D4 a few weeks ago for pc and enjoy playing it. I also played D3 on both pc and the Nintendo Switch. The Switch controls for D3 are actually easier than on pc imo, at least when playing LoD Mage Necromancer.
I actually play D3 on Switch with my 8 year old son, as it's pretty cartoon like and he isn't allowed to watch cutscenes. He's actually pretty good at it now and can even follow my speed playing Necromancer (he makes his own Necromancer, I have my personal zNec :P).
Now I'm thinking about buying a PS5 just so I can play D4 with him. I understand the itemization is a lot worse and more time consuming than it is on D3 (I still help him with the builds), but are the controls a bit equal to D3 and will he be able to play it?