I ran my ~2011 i7 MBA for 12 years as primary laptop before the battery finally killed it (had to run linux on it due to apple killing support the last few years).

Great hardware. I don't miss OSX though.

Same here. I use a MacBook M3 for work and it's nice (still on Sequoia though - new macOS looks horrible) but I also have my own 2012 MBP still working and running (recently taken out of the cupboard due to my Lenovo dying) with Linux on it; replaced the battery, put in more RAM, and put in a different SSD and it's still fine. Well made hardware.

my 16" m1 max w/ 64gb is getting a little sluggish on some things

I thought so too when I bought a beefy iMac Pro in 2017. But then guess what, new CPU architecture and 10 years down the line it's not supported anymore. Yes I can stay on whatever OS was last supported, but the tools also start ditching support slowly. For example, Rust no longer has tier 1 support for x86_64-apple-darwin so it's a matter of time when things will start breaking.

I am quite sure Apple will think of a reason to deprecate my M1 Macbook Pro (which works great BTW!) in a couple of years, at which point I'm switching back to Linux and will not be coming back. I'm tired of accumulating perfectly good hardware in my house which is nerfed by lack of software updates.