Whilt BG HQ isn't exactly meta, getting it and the upgrade doesn't provides you medics exclusively, contrary to other healing sources.
But the upgrade isn't mobile (Infantry Sections, Ambulance) nor does it have an easy aura (Ambulance), but it also can't get killed easily (Ambulance again) nor is it clumsy to use (Infantry Sections). Meanwhile Ostheer has to pay vital munitions and manpower that they really need for upgrades, abilities and units in their early-mid game.
Point being, all forms of healing in the game have their own upsides and downsides, and therefore it isn't really fair to compare them to each other. I think they should only be judged within their own faction's economy and ecosystem, and I think Soviet healing (mechanic and cost) within their own faction is fine (not great, not terrible).