I played "Advanced Dungeons & Dragons" on the Intellivision that my g/f had at the time. Most everyone else had Atari 2600s, so it felt rare (at the time) to play on it. It had a funky controller with weird keypads and a disc that was like a joystick, but hard to play with.
https://en.wikipedia.org/wiki/Advanced_Dungeons_%26_Dragons:_Cloudy_Mountain
Aren't the batteries and electric motors driving the grid fins at the top of the booster? That and the entire interstage are gonna get blasted with the thrust plume of three Raptors. Reinforcing them enough that it doesn't affect planned reusability targets could take a bigger bite out of the payload than they get from hot staging.
That was my first thought, or that the header tank up at the top might not like being heated like that.
I'm sure they'll figure out pretty quickly if it works or not.
Going to be interested in how they make that work with the intended recoverability of the booster. Excitement guaranteed, for sure!
I think Soyuz boosters currently do hot staging, the interstage is open IIRC.
It's a good search target for what has happened up to 12 Jun 23... after that? I can go incognito to reddit, get what I need then come back to here and continue using this as a resource and share what I've got.