It was really good at 60 splash damage, but whewn it got nerfed with no compensation, alongside the clusterfuck mines then RS kinda fell off the face of the earth. I wish Raid Tactics at least was a passive and not another muni-sink.
IMO it just needs some adjustments. As an idea it's fine but everything comes way too late to be practical additions to builds and the greyhound kinda sucks.
I think bigger changes are needed, if it's restricted to the bundle of paratrooper+ATG, if it's for a LT build it needs a bit more than costs and timing adjustments.
The Pathfinders are really the only thing it has over Airborne now, since the Greyhound can be good, but it's late timing (even with getting CP out of teching) now doesn't suit the LT build at all.
The M20 is much a more practical scout car and the LT also has the Stuart now, you don't need the M8 anymore for a LT build, just use Airborne.
Hell, give Airborne IRs and be done with this doctrine, heh~
LMGs are just better, but in Urban combat or when cutting off retreats, they can do some of the highest dps in the game.
It's a hisk risk and high reward unit with SMGs, LMGs are the safe option and really, the reason people would get them since they still can double them up.