It is perhaps more accurate to say that Apple has minimal focus on cloud services for large groups of professionals (i.e. enterprise users or large design shops

It is perhaps more accurate to say that Apple has minimal focus on cloud services for large groups of professionals (i.e. enterprise users or large design shops); consider that iCloud Drive prevents you from creating nested subfolders, a workflow tightly engrained in how practically all enterprises think about shared files! Which is not to say that there wasn't incentivization from MSFT... but either way it's a good move for Adobe to align itself with a brand whose cloud is always going to keep big business as a priority.