The collaboration features were introduced in 2013 on the web version, and in 2016 on the native versions. And maybe check which features are actually not available before dismissing it.
Maybe the person who the op was talking about doesn’t work on Keynote and … secrecy … they missed the memo?
What memo? :)
Six years ago Keynote supported simultaneous editing through share with iCloud
yeah, that's where all the top level production places want to store their pre release.