Yes, ALL Tech companies are trying to get to the complete walled garden approach where you will only be able to run very limited apps from the App Store only. Next version of gatekeeper to enforce and they will probably stop us from booting from any other drive with pre Has already done this with Windows 10S
The goal is to essentially turn the Mac from a powerful general purpose computer into a mere appliance like the IPad is.
This is all down to Apple and Steve Jobs in the first place with the original App Store.
This is great for Apple in the short term.
However, if they create such a sterile and barren landscape by discouraging all the power users 'geeks' etc then innovation will be massively stifled which will harm everyone.
It goes without saying that sandboxed "apps" will be less powerful than a program wihich can access the whole power of the machine.