Yeah, just leave them be. Some of them, might not be an issue if deleted, others...
Taking a wild guess here, as have not tried to mess around with the stock apps. The stock apps are all in /System/Applications folder, except for Safari, which is installed in the user space /Applications.
Anything in /System/Applications is under System Integrity Protection (SIP). Additionally, if you have an SSD, it's in APFS format. The System level stuff is in a read-only partition. From what I've seen on the interwebs, at minimum, need to disable SIP, and might have to stay in Recovery Mode and mount the read-only partition as read/write. Command line to delete things.
And once gone, if want/need to recover what was deleted, need to re-install the OS, as the stock apps are not in App Store.