It's true that SaaS does stop you from owning software... But what good does "owning" a piece of software do you if you can't get updates anyway? Back in the pre-internet era we got used to software existing as discrete versions but it hasn't been like that for a LONG time. As soon as patching became a regular occurrence, "ownership" became a service contract with a CD attached. Then the CD vanished, and it just became a service.

While I do dislike needless "as a service" stuff, that model does genuinely suit a lot of people. It's not a conjob; companies offer this stuff because a lot of customers want it. Most of the companies that are selling you SaaS stuff themselves use SaaS things in-house.