As for the price. Modular isn't cheap but you hardly need to be a millionaire. You can get a fully functional starting setup for $500 and add from there as you can afford it.
And there's no standard display API for softsynths. (NI have tried to produce one called NKS, but it's early days.)
And softsynths can have hundreds of parameters. Showing them all at once is always going to be a challenge. So most controller products either show nothing at all, or show a handle of items - like eight or so. Which are different for every synth.
If a softsynth supports OSC you can fake the tactility on an iPad, but the small size is a problem; I expect the Pro will be better, but still limited.
Music certainly works better when it's tactile, but - as someone who used to design and build modular hardware, occasionally for cash - I now find modulars rather ridiculous, and certainly just as limiting in their own ways as any other technology.
They make great toys, but IMO the spirit of modulars - build completely new things to make new music - is a lot more alive in software than hardware now.
Novation have made automap systems for about ten years now. NI have made them for a couple of years.
But aside from touch panel toys like the iPad and the Lemur, and some high-end mixers, I still haven't seen a system with more than eight knobs/digital labels.
It wouldn't be hard to design one. Unfortunately in a market where $200 is a lot for a controller, it's hard to make a project like that profitable.
There's also the latency issue of controlling anything via MIDI, a tweak of a filter will have a slight delay, and that can be enough to throw you out of the creative space you'd otherwise be in.