[rplnt]

I don't disagree with your points, but you can still sell software in the buy once model and just keep it live. No need for major versions unless they are needed. So the only point remaining is "we get more money this way", and that's something one could not want to participate in.

[oblio]

If you buy Jetbrains stuff you get a perpetual license included. It's just going to be for the initial version.