I regularly drive a 5k2k display on a 16" MBP, along with glowy keyboard and trackpad, and I only get the fan when I'm doing something like a full-screen streamed video: text editing and web browsing seldom trigger it.

I like the bigger screen, so I'll hold out on this platform for now. Pretty impressed with where the M series is going, though; might hold out two iterations instead of the four I had in mind before the M1 dropped.