Your laptop is definitely very capable. But it’s barely a laptop. Why not build out a proper desktop? This precision would be a pain in the ass to carry around for most people, especially travel. Dell made sacrifices to get that kind of power: size, cooling, and battery life. Those are actually meaningful things when it comes to a laptop for most people, even pros.
I think the fact that you’re even mentioning a MacBook <em>air</em> in the same sentence is very good for the Air. The M1 hasn’t really been marketed to the pro market until the recent release.
Also, 5x faster at what? The M1 is about the same performance as a W-11855M at single core cinebench, and only 25% slower at multicore. So comparison to the M1 pro/max is not very promising for the Xeon chip.