So as cynical as my statement may seem- " It's almost like they wanted it to be easier to just not take time off?" .. user ergonomics just doesn't enter into the conversation at all, because the users are internal devs.. who cares.
I also worked at an org that gave each of 50+ large customers a dedicated slack channel with.. wait for it.. the entire internal 200+ member engineering org in channel with them. You can imagine the mayhem as each customer figured out how to get attention (@here/@channel/@theguythatfixedthislasttime) and "hack the phone tree" as I used to call it.
This also meant the every one of our 200+ engineers was a member of 50+ customer channels which were filled with all levels of noise that 95% of the time had nothing to do with their app/team/function, and could/should be ignored.