personally think it will be like iphone soon and not with new machine but with firmware update
because is new capitalist trend like chinese companies hard locking bootloaders on phones like on iphone and more
i personally use mbp14 on NixOS and its awesomeeee soo much
and yes i deleted macos ignoring asahi team “you will dont get firmware updates”(for what? to get a brick because apple make new rules? to get slower machine because tim wants to you buy new M963773 Pro Max Ultra Plus) etc etc “how you will repair if something broke” (recoveryOS terminal just exist)
my next laptop will be framework if macbook die
linux works many times better than tim bloatware
I like risky sports (relative for some people it might be boring) but when I have to work or even play I want stuff that just works. I can’t imagine using a laptop and wondering every day if this is the last update to my OS I might get.
Sure Apple laptops might be great hardware, you might love the design, etc but just the fact that this question exists make it impossible to consider such hardware.
TL;DR: I don’t know and I don’t want to care. Please support OEMs who are not making money by selling locked hardware.