What do you need the filesystem for on your device? I've had direct access to my filesystem on my iOS devices since 2012 and it is very very rare that I use it

What do you need the filesystem for on your device? I've had direct access to my filesystem on my iOS devices since 2012 and it is very very rare that I use it. And when I do it is mostly for fun and exploration, nothing a normal user would be doing anyway.