I'm not sure what those are, but I think they probably have to do with the ablity to hover in place/land anywhere, a capability probably much more meaningful in transport helicopters.
And it seems the US has decided to choose the V-280 Valor, which is a tiltrotor rather than a helicopter.
I don't follow the space closely, but it seems to me there's no active program in the US that's developing a combat helicopter that's likely to enter service, so I don't think the US military considers them to be worth investing in that much.