The M20 has pretty good vision that only gets better with vet. I don't remember for sure, but I think the WC51 also has decent sight. You can also go Captain for On Me! eventually, which can rescue squads from suppression.
Yea, they are good but you give up fuel in the meantime before you get them out. I think rushing the fuel and placing tank traps and sandbags on or near the point is the way to go. Then stalling for pak howies or mortar hts (if the enemy goes turtle build) is the best and most consistent way to play usf. I kinda have strats I closely follow to avoid being hardcountered.
Examples:
Enemy goes mg or mortars? Go pak Howie
Same build but has okw teammate? Go mortar ht because it is difficult to kill with walking stuka.
No mgs but gren spam? Rifles and 50
Sniper and gren build? Rifles and rush m20.
The sniper builds are the most difficult to counter as usf but I'm not mad because I know it takes skill using them. Also I use them myself.