It does have a nice GUI.
Modartt is actually incorporating that in their next " Pro " version too.
It is necessary IMO as when you get global parameters only, they hardly can be applied across such a wide range of frequencies.
A good example is what is called string stretching in PianoTeq 3.0 by Modartt.
While it allows a very convincing amount of false beats ( triple string detuning ) to be applied in the upper octaves, which makes it sound very authentic, that same effect carried down to the lower octaves is unnaturual sounding, well actually it sounds like crap.
I downloaded the demo, and can finally say after 3 1/2 years of agreeing with everything you ever say, I can finally respectfully disagree.........
This is cool as an electric Piano, but it sounds as if it were in a can even w/o effects.
The price is too high.
The effects are weak.
And the sounds are unconvincing, just like every other PhysMod I have bought. I have 3 of them, and PhysMods have a better touch to them, but they still don't sound as good as Scarbee's Rhodes. I have disloyally tried LoungeLizz, Modartt, Ray, Logics Mac Plug and 2 or 3 other ones and they all suck.
One thing though is these guys are ahead of the game and have a great chance to be the go to plug, but they really need to get a real Fender Rhodes and Wurlitzer, and sit down and listen to someone play it in all registers.
They have the Middle C and 2 octaves up pretty close, but the high end bellish tones are missing, and the hard velocity bark, as well as the low end tine sound.
But I am an asshole about these instruments, I used the real ones for years.
I have a great Wurlitzer and Rhodes, but no combo organ or D6 Clavinet after 25 years I find it truly pathetic that developers can't get these basic instruments to sound convincing. I heard Scarbee's D6 Clavinet but I would have to disable tons of release samples as they are way overdone. It seems that developers are more concerned with these release samples that can hardly be heard in a band context, and only on a song like Superstition can you hear Stevie Wonder stacattoing the notes perfectly and even then the release sounds blend with the original notes. Sampler developers make these two sound almost seperate and always way to loud just to show you they knew a slight release exisited. Same way I use to use my first hardware reverb.....

. Hell I paid 2500 USD for it and I wanted to hear it !!
For a little less money one could buy the Modartt PianoTeq 3.0 and have a great sounding and playing Piano, and a passable Rhodes and Wurlitzer.
These guys have a great start though, and I will be watching to see if they upgrade it, or have a BETA forum with a bunch of old bastards like me and listen to our critiques.