> For example, why does any app need to know which other apps I have installed, and how long I use them? This permission should very sparingly pass the review process, and only for apps in specific categories.

Since I can't edit my original comment, I chose to reply to it instead of replying to everyone who corrected me. Yes, there's no API to directly query installed apps and usage on iOS. I think I got the wrong impression from years ago, when the function canOpenURL() could be abused to detect which apps were installed[0]. Thank you all for the corrections.

0. https://useyourloaf.com/blog/querying-url-schemes-with-canop...