Agreed that with adequate RAM on board an MBP with a Max M (1,2, or 3) chip can be a machine for demanding professionals as you state. The M-Max chip is a beast, with each newer model stronger still. However your post implies that MBPs are only for demanding professionals, which is not correct.There was a time not so long ago that you needed the most power Apple put unto their machines to give said machine any kind of legs.
No longer. Apple silicon is a revolution. My M2 MBA 13" is the best laptop I've ever had BY A LONGSHOT and FAAAAAR exceeds my needs for a computer.
An MBP is EXACTLY what its name implies: A machine for demanding professionals that need every inch of the additional power over an MBA in order to make money, either via shortened workflows or sustained high-performance over long periods, coupled with portability.
Since the M1 came out, and in the Mac space, when Apple says "Pro" they mean it.
MBPs at lower spec base and pro chips are fully appropriate for folks with lesser needs who want more ports than MBA, the better MBP display and the better MBP speakers as well as performance room to grow.
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