I play a Baba Yaga witch, and you can get pretty creative with Spirit Object (if your GM agrees). We recently fought a gibbering mouther with weakness to bludgeoning damage, so I spirit object’d a +1 mace we had picked up earlier in the dungeon in order to attack, while simultaneously delivering the weapon to our champion in the front line! You can also combine it with consumables, like a smokestick to conceal your allies, or a pint of oil to start small fires.
I use both frequently, and the size of the switch is a big feature for me. I carry a low profile case and no power adapter. Increasing the size would be a big mistake in my opinion- it would just be a worse steam deck without some really killer new features. In my opinion they should just offer larger joycons for people who want them!