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.

How would you make a video app in a browser? ie taking videos and then editing them afterwards

The commenter says about most apps. The use case you mentioned requires computing resources. You can do the whole thing on browser too but it is not efficient way . But in the case of delivery apps, finance apps, you don't need much compute as can work exclusively with APIs .