No different than "windows" or "desktops" or "files." When was the last time you actually saw a file folder? Or a document separated by sheets with "tabs."
95% of computer users have never seen an ethernet cable, but they're still the symbol for networking.
99% of car drivers have never seen brake calipers, but they're part of the icon when my car's parking brake is on.
Where it falls down is when designers force too many of the paradigms of the RL original onto a platform that doesn't suit it [0].
[0] See for example the Mac OS X Address Book app https://www.betalogue.com/2012/01/15/abook6-dumb/.