It depends on the sensors you need access to. An iOS PWA has access to Geolocation, Magnetometer, Accelerometer, Gyroscope, Camera, Audio, Apple Pay, etc.
Assuming the audio happens after user interaction within what iOS consiters "one event" and/or the camera is used within a safari tab and NOT "added to home screen" (once you do that getUserMedia does not work any more).
Until iOS gets their shit together and makes it so that adding a glorified bookmark doesn't remove features, it's not a real viable option.
Until iOS gets their shit together and makes it so that adding a glorified bookmark doesn't remove features, it's not a real viable option.