Let's start stating some facts again as wuite a few people are missing the point and to make the current differences clear to everyone before potential bullshitting.
OST: no retreat point, halftrack reinforcement, bunker reinforcement and healing, one-time single squad healing for muni each time the ability is used
SOV: doctrinal FRP on one single commander, halftrack reinforcement, NO healing outside of the base sector
OKW: FRP and healing upgradable when teched (both together quite expensive and rarely seen in smaller modes), med crates healing. Volks self heal in late game at vet5
USF: mobile FRP, reinforcement and healing. Most expensive healing unit in game and there are no other options. Comes at the price of constan tuse of population and opportunity cost for not using abilities of the major
USF: FRP, healing and reinforcements in FOBs. VERY expensive to build both, I would assume that even larger modes rarely allow Brits to get both down. Upgradable AoE healing on IS as pay-once upgrade
For completion sake. Might still miss something.
OH:
-There's the whole medical supply drop which boost stats as well.
-Not now, but i think balance team tested giving the new commander HT some FRP but then was removed as it was not intended.
-Since you mention self healing, Stormtrooper/JI can do so(?)
SOV: you are missing several ones.
-Doesn't the new commander allow to drop medical crates on top of FRP ?
-Commissar heal.
-FHQ allows reinforcement and healing
USF:
-Paras don't sel heal? They reinforce on radio beacons.
-Doesn't the Halftrack are able to drop medkits ?
OKW:
-Sure there are more self healing squads.
-Opel Blitz
UKF:
-Halftrack
-Commandos self heal
-FHQ (only reinforce)