Everyone knows all the apps on your phone

I still, will never understand the need for native "Apps". To this day, I have never seen an "App" that couldn't simply have been a website/webapp. Most of them would likely be improved by being a webapp.

The only benefits I can see of "Apps", are the developer get's access to private information they really don't need.

Yeah, they get to be on the "App Store". But the "App Store" is a totally unnecessary concept introduced by Apple/Google so they could scrape a huge percentage in sales.

Web browsers have good (not perfect) sandboxing, costs no fees to "submit" and are accessible to everyone on every phone.

This is a bizarre take. Are you also suggesting there’s no reason to have a native app on a laptop? Because it’s essentially the same question. There are many things which a native app can do that a browser just cannot do well, or at all. I don’t know what your needs are, but for example if you’re doing heavy video or audio editing, accessing heavy amounts of RAM or utilizing GPU compute or doing other things on the bare hardware, doing that all from a browser is definitely not there yet.

On desktop you do productive work, your apps need native capabilities. On mobile, apps are primarily consumption, displaying, browsing... no complex interactions.

Lots of people use iPads for content creation. I think your worldview on this topic is a bit narrow. There have also been multiple feature length movies shot on an iPhone, at least two of them by Oscar winning directors! Those weren’t done on a mobile browser.