I've got a good-sized collection of vintage hardware and software. Microsoft stops supporting something? All well, I've got my older versions still available. They don't get updates, but for the most part, I didn't expect them to when I bought them.

> you pay only to keep support over the product you actually use and need.

And you pay it over and over again. Until you don't need it (which might be because they removed some feature you were relying on, with no recourse).

> but being able to keep running your old apps is not the norm

Losing access to my old apps isn't the norm, unless I choose to let go of control over my own computer's software.