Technology has come a long way. Pianoteq is amazing. The Kawai VPC1 was a pleasure to use when paired with nice monitors and a sub.

But, in addition to the sound (like half-pedaling), I'm talking about the actual feel. A digital piano's pedal will always feel like a buttery spring. On an acoustic, you can feel the vibrations, the felts, the engagement of the dampers, etc. in your foot.

It's really minor, because a great pianist can do fine with these very good digitals, but you lose a sense of "one-ness" with the instrument.