I think there is "6 or so" system apps:
Time Machine.app
Siri.app
Launchpad.app
Find My.app
App Store.app
System Preferences.app
Mission Control.app
Font Book.app
And some other apps (28, root Applications folder):
Calculator.app
Books.app
Calendar.app (
Day-O is more system than this?)
Chess.app
Contacts.app
Dictionary.app
FaceTime.app
Home.app
Mail.app
Maps.app
Messages.app
Music.app
News.app
Notes.app
Photo Booth.app
Photos.app
Podcasts.app
Preview.app
QuickTime Player.app
Reminders.app
Stickies.app
Stocks.app
TextEdit.app
TV.app
Voice Memos.app
Safari.app
Image Capture.app
Automator.app
You also always have option to hide apps, before macOS 10.15. Should not be an issue for anyone in 2021.
And yep, problem is not with size, i just want my Applications folder be not flooded with useless stuff, that will be never opened, because this is default installation folder for apps and packages.