I don't think Adobe knows either. Lots of people are still on Magento 2, and lots of big customers with a LOT of invested money into the platform, however the amount of people jumping into Magento is shrinking as the use case is getting attacked on both ends, on the cost for SMB and the benefits for large companies.

Having talked to adobe reps a bunch it's also they have no idea how things work and how all their tech fits together as Adobe continues to gobble up disparate technologies.