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Last time I tried, working with local files and folders was slow, not well supported and awkward. But I may lag.

WebKit published a list of things they don't/won't add support for, so you can count them out on iOS.

I have an native app for both platforms which uses some of these because I can't do it with a webapp, I'd love for everything to be done in the browser.

Web Bluetooth

Web MIDI API

Magnetometer AP

Web NFC API

Device Memory API

Network Information API

Battery Status API

Web Bluetooth Scanning

Ambient Light Sensor

HDCP Policy Check extension for EME Proximity Sensor

WebHID

Serial API

Web USB

Geolocation Sensor (background geolocation)

User Idle Detection

I think browser push notifications are considered a bit of a failed standard. Lots of browser's don't support them e.g. iOS browsers.

I haven’t tried iOS PWA push notifications yet, but I was under the impression that they should work similarly to the native ones. I agree that the standard is wonky, but if you develop a PWA with specific iOS polish, it might work well.

Is there a writeup about how they work? Is there a message broker server that the browser stays connected to?