That’s basically how IGBTs in power electronics work, in stuff like trains and electric cars. It’s a sensitive, easily activated voltage-driven MOSFET driving a larger BJT transistor in a chain.
Also how Darlington pairs work. So, yeah, maybe they could do all the computation at that level and then cascade the output through larger transistors to talk to the outside world.
I think you’d like this channel: https://m.youtube.com/@CoreDumpped