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Yes, installed PWAs can run fullscreen. This limitation exists only inside of Safari proper. The intent here is likely to avoid the messes that could be caused

Yes, installed PWAs can run fullscreen. This limitation exists only inside of Safari proper. The intent here is likely to avoid the messes that could be caused by arbitrary sites being able to fullscreen and confuse or trick the user. Requiring a user interaction to fullscreen doesn’t help here much, it’s easy to attach the function to an innocuous looking link or image that baits users into tapping them.

nox101 3y ago
And yet (1) Firefox and Chrome has shipped with that ability for 10+ years on Android and the world hasn't ended (2) PWAs are effectively apps. Native apps can do that those things so there's no difference in terms of risks. You could certainly make it so web pages can't but PWAs can. Also, no, Safari PWAs do not do allow you to lock the screen orientation