As a, primarily mobile developer, my own MacBook Air (MBA) and it's the M2 version.

I do get provided with MacBook Pros (MBP) for work but there's always that advice of separating your own stuff from work stuff. And I wanted to start doing my own stuff and experimenting with beta stuff and the like without messing up the stable dev environment for work. Even though I did consider shelling out for the MBP for more power, I think I valued portability more and the MBA was just way lighter and so far, all the stuff I'm tinkering with are relatively light weight or the M2 just handles it just fine.

Also the act of switching hardware physically gives me a good separation of life/hobby from work, especially not having access to my work code and environment which gives a bit of anxiety, just like the aura of being around work doesn't make me relaxed.