Don't think they've added PS5 version as EA. Controller support won't be in until the final version (they played some sections with a controller on the last panel). If it's anything like DOS2 (which it probably will be), controller will work fine. Running around is actually better on controller than on PC in DOS 1-2, and looting is better too due to them having a loot circle. Holding the loot button expands a circle which lets you loot multiple containers at once. Not sure if that was ever implemented with keyboard and mouse.
Being purely turn based is also a plus, since it doesn't require constant inputs to move in fights.
Possible downsides
- Inventory management (moving stuff around) --- This might be less of a hassle since there is now confirmation that there will be separate bags for different items like camping and alchemy supplies). In DOS2 I always had at least one bag per person for consumables and such which I had on the main "use" bar. Like a bag for arrows for the ranger. Their system works great (assume it does in BG3 too) where if you have something in a bag like 1 poison arrow, and pick another one up with that character or send it to them, it will auto stack in whatever bag you have that item in.
- Crafting (moving stuff around)
- Menus. No hotbuttons, but rather hold a button like L1 to open up a wheel and select Equipment. From there you select individual items.
Going by DOS1 and 2, Larian is quite good at making their games compatible and as natural as possible with a controller. So if PS5 is your only option, it shouldn't really be a problem. PS5 also has split screen coop, not sure if the PC version has that. That's rare to add these days, even on consoles.