When was the last 4yr window on a computer? I think the ati 2011 15” mbp got dropped fast af but thats the last real short one I remember. I haven’t dealt extensively with the touchbar models though.

The m1 air looks to be another 2012 mbp 12”. It would surprise me if they cut it off at 7 years. Although that decision seems to have been driven by the enterprise install base and who knows if that’s still what it once was.

I think the reason why mobile os support windows are apples thing on computers is because they don’t have a separate business line. Iirc xps used to be dells enthusiast brand and now it’s part of the business line.

Thinking more about it, the core line of processors was a real stumble for intel because they were really good and lasted forever and manufacturers had to start pushing updates to fix realtek and qualcomm chip problems or get blamed for shit not working or being supported.

Also, this is kinda tangential because the op is asking about firmware support and hardware availability and firmware support is not as important on macs and they have incredible second hand hardware markets.