While I agree that automation and recall are advantages, is moving a knob with a mouse (or typing values) less constraining that moving a knob, let alone several at once? Personally I'm much less distracted with my hands on the knobs (often with eyes closed) than looking at a screen.
There are so many variables in an analog world that I find it difficult to believe that all can be reproduced with complete accuracy through logic as much of it is illogical. Yeah "close" or "sounds like" but still not the real deal. Analog is organic, living and breathing. The sound of tape is dependent on speed, how hard it's hit, formulation, bias, alignment, and hundreds of other variables. Tubes change based on heat, load, age, and other factors. Would someone create code that added a different character based on how long the plug-in was running in the DAW?
I do feel plug-ins (really software as I put outboard digital hardware in this category) have their place. There are definitely things that can be done digitally and through logic that can't be accomplished via analog, that's its strength. Why not use both to their strengths rather than have one try to be the other? If costs were not the issue, would an analog emulation of a Weiss unit make sense? IMHO it's redundant, development and research could be better spent elsewhere. If you want to make money by telling people that they can buy something at 1/4 the price that sounds like the real thing that's another story.
Vegetarian/tofu versions of beef taste like the real thing but it's still not steak.