Not obsolete but outdated. As owner of 2018 15”MBP bought on release, I got really p***** 4/6 months later when Apple’s released an updated graphics.You make a good point, but Macs aren't obsolete 6-18 months after release. I think a hardware subscription would be cool for people who want the latest all the time, so I'm not against it.
Recently I was without my machine for 30 days, so Apple could figure out and solve an update issue with Big Sur (T2 related).
So personally I welcome the possibility of having a hardware/software/services bundle for which I pay a fee, if terms of service sustain 24/7 always on operation. Not having to deal with resale and having the latest tech are added plus.