That if/then is a counterfactual that deserves thought. I'm sure someone in Cupertino is tasked with measuring out the win/loss if MacOS goes full iOS. I wouldn't like that MacOS either, but that isn't relevant to a good decision.

  Pro:
  1. MS Office is basically completely a web app now. No binary install needed. iOS binaries are already present and optimized.
  2. Adobe subscription software is not far behind and iOS versions are present.
  3. Antivirus what? in the iOS model.
  NB. You can install your own iOS shell (if it connects to something other than localhost).

  Con:
  1. Apple has a relatively small business selling FCP etc. 
  2. Apple has a larger business/ecosystem selling App Store shovels/lotto tickets that need dev environments.
  3. Apple's high end use is a halo for lower end Mac sales. If restrictions cripple high end use and they lose the halo, then the aspirational crowd goes.