I'll give a similar reply as I did to your other comment: the most popular platform for interacting with low-trust applications, the web, sanely does not allow apps to access your whole filesystem. It would have never thrived as it did if users had to limit themselves to a small selection of vendors they can thrust with their whole system.
There's a huge difference in usage between apps on desktop OSs, which are often of less commercial nature, open-source, and more carefully vetted by centralized gatekeepers, and the mobile app ecosystem, where any random fast food chain will entice you to install their app to make an online order. The smartphone app ecosystem has to be low trust, like the web.
> the most popular platform for interacting with low-trust applications, the web, sanely does not allow apps to access your whole filesystem.
Yes, obviously, arbitrary code that is executed from over the network at a time you can't fully control and programs that you install and run on the device that you own have different levels of trust. Are you seriously making the argument that code from https://facebook.com running within your browser cannot access your filesystem then that means every single executable on your machine should be incapable of doing that as well? Wasn't this the same site that complained to high heavens about the constant permission prompts in macOS Catalina?
> which are often of less commercial nature, open-source, and more carefully vetted by centralized gatekeepers
I'm sorry, this is just blatantly false (as literally decades of malware on the desktop can attest).
There's a huge difference in usage between apps on desktop OSs, which are often of less commercial nature, open-source, and more carefully vetted by centralized gatekeepers, and the mobile app ecosystem, where any random fast food chain will entice you to install their app to make an online order. The smartphone app ecosystem has to be low trust, like the web.