This is just another example of Apple's severe structural deficit on their cloud engineering teams. From a user perspective, Apple's backend engineering is in desperate need of a management shake-up.
Apple rarely has infrastructure issues this large. Mind detailing your "other examples" for evidence?
Are there other examples of Apple's cloud failures?
Imagine the furor if you could log into the same account from Dropbox in two different places and not see all of the same files.
AFAICT, the iCloud Drive revisions were essentially an acknowledgement that the first iCloud backend API and implementation was just a great big mess. Seems to be a huge case of overpromise and underdeliver, which sadly seems to be the banner motto of Apple's cloud offerings.