Admikar
Where do you get that the V-280 can’t take off and land like a helicopter? It’s hover envelope exceeds that of a UH-60 and it met all of the “helicopter” mode maneuverability requirements in the FLRAA spec. Having witnessed V-280 demos low speed maneuverability is not an issue. As to decel/accel the 280 can tilt the rotors past 90 to rapidly decel with a level fuselage, and when it wants to depart the rotors tilt forward and it is gone (very Airwolf-ish).
it is the close stacked coax config of the X-2 technology which has maneuverability issues. Despite stating the rotors are so stiff they can never collide under any circumstance, the S-97 demonstrated this was a lie when the rotors on the S-97 collided while in a hover during computer induced roll reversals which occurred at rates less than expected in aggressive flight maneuvers. That incident exposed the fatal flaw of the ABC for all to see.