WTH are there no "select all" button when managing files from the media folder?

Lets say you want to delete all files of a media folder at once, you have to click each files one by one, there are no “select all” button. “deselect all” does exist so why “select all” does not ?

I know there are other ways to do it like using File Editor, Studio Code Server or a samba share, that’s not the point.

Why is a “manage” button even there if almost all basic file management options are missing from it (copy/paste/cut/move/select all)?

Also, why cant we select a folder?