Paid to be lazy
Meanwhile, inside the padded cells at Adobe HQ:
MBA1: What do we do with CS to keep selling the latest versions and maintain revenue? The suite is mature and innovation is too much like hard work and expensive. How much more bloat do our suckers, cough, customers need?
MBA2: Why don't we switch to a subscription model? We can rest on our laurels, fire half the staff and just throw users a bone now and then while raking in the cash.
MBA1: But won't existing users just quit upgrading and stick with their old versions if development of the suite stagnates?
MBA2: We'll stop selling it outright and eventually they'll have to lease it permanently because they'll be incompatible with the latest version. We just mess around with the file formats a little. It's genius!
MBA1: Great job everyone. Hefty bonuses all round!
While out in the real world: CS isn't structurally dependent on cloud services, and enterprising people in China, India and Eastern Europe are setting about addressing the lack of a standalone installer. The internet has a long track record of filling artificial vacuums.