pianow i'd say you'd be better without the CLAIRE if the MD is completely working for you
I agree with this. Claire is a nice supplement for doing cool things. Claire won't be replacing Modern D for me neither.
That said, there will be some things I absolutely would rather play on Claire than Modern D - bombastic non-classical things; movie soundtracks (I played Interstellar, Pearl Harbor, Chariots of Fire, other fun things, employing the sub as well) that sound amazing with earphones. The deep bass is something special, even if partially due to effects. The user interface for me so far is more manageable than the Noire.
I've also been toying with the color, timbre, and release settings and able to get some really good'ol acoustic sound from it, and it sounds rich and lush (non-VSL'ish). The interface/playability isn't going to give me the "omg I feel like I'm playing an F308" but it has certainly given me the "this tone sounds amazing, and I can make it happen" - it just will be a different vibe than pretending I'm on an acoustic piano. One can deduce that Claire is intended for "cool things" because it requires tweaking to get clean acoustic sounds (lol).
Thus the Claire won't, and shouldn't, be compared with Modern D. As @pipAT and others alluded to, Claire and NI as a whole isn't designed specifically for pure pianists per se.
If I'm sipping on a nice drink, I will choose the Claire (for now).
If I'm trying to "emulate the acoustic" I will choose the Modern D (for now).
Don't be surprised if my opinion totally changes in the coming months. The way many companies have improved their product (Pianoteq 8.4, 280VC & SK-EX versus Pianoteq 1.0 and K2 piano); VI Labs (Modern D); Claire (versus Alicia's Keys, other pianos with poor pedaling or UI); I anticipate a continued upward trajectory of fun and impressiveness.
I think we're getting to a point of diminishing returns in terms of improvements, yet we still see improvements. That's saying a lot!