Question on component design best practices

Whenever I have a 3d printed part that needs something inserted (such as a nut or magnet), I always design in a "breather hole" that you can use with a paperclip or pin to push the component out again without destroying the print. With that in mind, is there a reason that Prusa doesn't do the same with their 3d printed parts? For example, trying to recover the magnets and square nuts out of the filament sensor when upgrading to the new core one plus was a nightmare, of using a hacksaw to cut apart the old part.