Amplitube 5 has been out for while but still no undo functionality--and there some interactions where you can inadvertantly really mess up a setup and its really hard to correct. Undo is simple needed.
I associate low quality, unprofessional plugins with having no undo.
Yes, I'm trying to shame IK into adding undo.
I once worked on a massive CAD app with no undo, all the engineers said it was impossible to add. Eventually, a great engineer stepped up and said she was going to attempt it. A couple months later we shipped it "now with undo"! Our customers loved it, of course!
If others feel the same way please post!
PS: are there other good amp sims that have undo?