Hi,
Most of the built-in apps don't take a lot of space - FaceTime ~13.2 MB, Chess ~7.3 MB, etc. I never use most of them either. Unfortunately, many of them have components that are used system-wide, and Apple is ever increasing the security/integrity of macOS, so that require components aren't deleted which would cause system stability issues.
Yes, it can be a pain to scroll through them all in the Applications folder, but that is what the Dock and Launchpad can help with.
Sorry, but it is what it is.
C