You're heating food to eat. How is that not cooking?
These also constitute fixing a light breakfast, i.e. having a meal in the room.
So, yes, if a family wants to fix snacks or meals needing to be heated, they'll want the equipment you mention along with the studio-equipped paper dishes and plastic utensils. And, will definitely prefer the DxS in VGF1.
We never wanted to do any of that when staying at the GF because we were stuffed by the DxDDP. I think once the dining plans return, the RS may have quite a lot more appeal for people like us who rarely eat anything in their room.
You and I clearly differ somewhat on this, characteristic of someone as inherently vacation-lazy as I. "We sit and someone else sets food in front of us"--part of my WDW mantra.