I absolutely do not want VS Code to be an iOS or Android app, since that means giving up all the massive progress they have made towards fully open web-based development and bowing down to the gated App Store model. If that means a less than perfect experience on iOS devices then so be it. VS Code as it exists today wouldn't even be allowed in the App Store under existing rules.
iOS at least has second-class support for PWAs via 'add to home screen', where it does take up the fullscreen like a regular app without any attestation to a central authority (besides the CA/B racket and Google safe browsing of course).
