I've been running my 12th Gen Intel Framework for just over a year (since I got it) with Linux (KDE Neon). Bluetooth, expansion cards, thunderbolt, wifi - literally no issues. I haven't even had to fiddle with it. I use it all day for work (software engineering - lots of VM's and browser tabs) and all evening for Minecraft and movies. When I'm at my desk at home it's plugged in to a Thunderbolt 4 dock driving two monitors and getting Gigabit network speed.
Before that I had a brand new Dell XPS 13, which again I had for a little over a year, running KDE Neon. It wasn't used for work as much, but again it worked perfectly fine, including the touch screen I didn't even want on it (okay- a major issue was the battery life, which was atrocious).
(FWIW I agree with you, Linux on laptops is a recipe for pain)