How do you mean? Phone OSes prove the model works, at least for ordinary "productivity apps". Linux kernel features to enforce it exist and are well tested, and

How do you mean? Phone OSes prove the model works, at least for ordinary "productivity apps". Linux kernel features to enforce it exist and are well tested, and are used by Docker and Flatpak. Microsoft implemented the technology, but had trouble getting developers to actually commit to it (which is rational, why choose a harder option if there's no incentive?). And MacOS seems to be doing a good job of balancing increased default restrictions with maintaining escape hatches where needed