I daily every os for 2-3 years and then switch. There are lots of benefits to OSX. Stability, perfect Standby and battery runtime to name a few. This would not be possible if they would support older Hardware. As long as windows and linux is unable to archive similar metrics, they prove apples point about this topic. Just look how fast everybody transitions to M Processors including the software developers. There is no point to stay on old hardware with apple.