I don't like to get that deep into hypothetical territory. No one has seen the Pimax deluxe head strap in person yet, so we have nothing to base that statement on.
That's not to say that the Pimax headset would provide a better or worse experience than the Vive Pro. The fact is we just don't know.
What I do know is that the Vive Pro head strap is a big improvement over the base Vive and the deluxe audio head strap.
I can also say with confidence that the headstrap on the V2 prototype that I tried in October isn't as good as the base Vive head strap. I'm sure the retail version will be better, but we won't know until we get to try it.
I am curious why you think marketing the Vive Pro to workers and developers is a bad idea? There are other HMDs on the market, but many companies are already setup with Vive headsets and base stations and their workflow/business model revolves around the Vive platform.
A better HMD is likely a bid draw for those people.