After reinstalling Adobe CC I have noticed that hidden system files are displayed in Bridge although the default settings are applied so no system files displayed in Finder. It is just on the main SSD but since other people are working on my system as well they could accidently delete a system directory like etc, core etc.
This is a known issue, right now there is not a workaround. Those system folders are protected- Mojave actually has extensive protection to avoid changing the operating system. You shouldn't be able to delete them.