At least falls' doctrine doesn't have a 240 muni ability that simulates a stiff breeze...
Falls don't need to pick upgrades "to taste" because they have excellent DPS at all ranges.
Falls get 2 types of nades, camo in cover, and faust. Is that enough abilities for you?
If valiant assault + smoke/recon + strafing runs and airdrop reinforce ability + falls isn't enough synergy for you then I don't know what is.
And no, I didn't say spamming falls just for faust. Faust lets you spam falls without elite infantry's traditional drawback of not having snares. Stop smoke screening.
A stiff breeze? You mean that P-47 strafing ability that tracks tanks into the base and forces you to leave or die? (Albeit it is very RNjesus dependent...)
Falls dont need to upgrade to taste, but as such they also don't get the abilities that go with it. Tatical advance with Thompson is far better than even FG42 for wiping retreating troops. Also 6 man dual LMG squad survives much better than 4 man squads that lose 25% of their DPS as soon as someone drops.
Paratroopers get tactical advance which is an insanely useful ability for wiping, or suppressive fire which lets them win most 1v1 engagements quite easily. Grenades are useful, but don't act like USF paratroopers doesnt have a grenade. The snare is quite good though since I cannot just pick up 2 elite bazookas and get snares at the same time.
I would also like to see how often you can use that combo of ability since you will not have ammo. Pathfinders beacon is free sans the cost of the squad, and the other ability gives you significant flexibility in teching.
If air dropping MG and AT guns, then being able to reinforce them anywhere you like by placing a beacon, or reinforcing a 6 man LMG team behind green cover or on critical buildings indefinitely isnt synergy then I don't know what is.