3.0 brought along a severely improved response of the software, plus multilayer multiformat playback, among other things.
3.5 brought AMA and keyframeable color correction, among other things.
4.0 brought mix&match framerates, among other things.
O yeah, all of this at a fraction of the usual price of updates.
It’s OK if you’re fed up with a mfg or vendor, but it would be best to stick to the facts at the same time.