Why lack of mobility/retreat is even an issue? If you have them next to med truk and schwerer, you don't need to retreat.
Double leigs is so bs currently.
Sitting safe next to med truck, schwerer and sniping everything in range of 100+
Before you can get Katy, you will bleed like hell.
Did not that Major kill everything in damn long range preventing from infnatry assault
Priest is the only option for USF but again, late game and it leaves you vunerable to tanks since you must invest in priests.
Laser gun with suppression, negating any cover play, with short shells travel time, destroying all emplacements.
Pack howies might be good, but they don't have 115 range, they are not protected by med truck and schwerer and USF don't float MP like hell so they cannot afford getting 2 of them.
Today I had a game on Kharkov against OKW. I outplayed him with infantry very well.
Vet 3 cons, vet 3 Maxim, vet 3 shocks but he had well digged down position with med and schwerer I could not approach. He made 2 legis and kept them safe in that spot.
It was insane. He was losing squads all the time, bad micro etc but leigs did the job themselfs suppressin and wiping my infantry all the time without chance to react.