Unfortunately Apple has crippled PWAs compared to the exact same code running in the browser on multiple occasions. Up until just about a year and a half or so ago you couldn't access a WebRTC stream from a PWA. The main use-case I needed this for was for a barcode scanner (which uses WebRTC under the hood) so my options were "deal with browser chrome" or "repackage into an app", I ended up doing the second (and to be fair that was my ultimate goal) but I would have preferred to skip dealing with that until later (prototyping is still faster on web for me, even with live dev builds on mobile).