It's nice to see the return of the OV-10. I know that it's an Army fad to have a fleet of anti-tank helicopters. Hell, we even convinced the Russians and the Chinese to build such a fleet. However, pound for pound, and dollar for dollar, an attack helicopter is much less capable than a light attack aircraft. All armies would be better served to relegate their anti-tank mission to light attack aircrafts.
In terms of the runway requirement, the modern attack helicopter company occupies such a large area that it is simple to plop a runway down the middle. If you think about the payload of an AH-64 (about 2 tons), it is a ridiculously expensive platform for the payload. This article summarizes many of the advantages of a light attack aircraft over an attack helicopter.
The reason the Americans started down the road of an attack helicopter fad, was because the Key West agreement took away the Army's fixed-wing attack aircrafts. So the political agreement steered the Army into the rotary wing CAS alternative. For some reason (maybe Fire Bird?) this political compromise became an international military fad, still going strong. The Israeli have one; the Russians have 3; the Chinese and the Indians are working on it.
This fad proves that groupthink will transcend bureaucratic boundaries. It is so sad it is scary.