For what I understand, propulsive propeller aircraft have two advantages:
1. the propeller wash doesn't interfere with other parts (wings, tail, ...) so the lift surface have a better, more laminar flow.
2. the ride is smoother for the passangers (same reason as above) and quiter (noise generated further away and at the back), + better visibility (case of single engine aircraft).
Why then so few designs of this type are succesful? The Beechcraft 2000 Starship (twin) was a complete failulre, as was the Cirrus VK
-30 (single). Why don't we see propulsive private aircraft, or Bombardier or ATR commuters?
Thanks for your thoughts.