This can't be entirely surprising given that Apple has lost it's focus on the desktop, and Windows is Adobe's, by far, largest platform. There was probably a lot of incentivization for this from MS as well.
Adobe is hooking its Photoshop, InDesign, Lightroom, etc. customers into a subscription-based cloud platform...they had to choose whether or not they wanted to offer their end customers Microsoft or Amazon's SQL storage space and ML capabilities.
Microsoft probably gave them a killer deal they couldn't refuse as they continue to fight their way into the cloud services market.
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.
This really only means they don't add a lot of things to the desktop. macOS pretty much works the same between Snow Leopard on up.