A 14 year old Macbook Air is an Intel Mac, AFAIK most hardware is pretty well supported.

M series Macs are still very much a work in progress. I'm typing this on one, in Linux, so plenty of things work, but not for example USB-C output to an external display, and a lot of the processor power level / suspend stuff is still not fully there so battery life is quite a bit worse, especially when suspended. I think the situation is rather worse on the latest generation hardware, too.