And there is still always a good amount of risk involved by putting all faith into a single unit...
I don't see much of a difference with getting swarmed by 2-3 mediums instead (beyond a heavy being a bit more reliable at closing the game fast).
TBH, i'm surprised by this response.
You can't magically pop out (double T3485s are no longer a thing) 2-3 mediums at the same time. They require more micro and allow the player on the backfoot plenty of opportunities to recover. The tools required to deal with a medium are completely different than the ones required to deal with a heavy tank.
And even if you found yourself fighting against several mediums with a lower amount of AT units, the defending player can still manage to kill one or 2 if he plays his card right.
Stalling for the 17/20 min heavy tank is not the risk option, it's the safe choice at the moment. Getting the medium and allowing the opponent the opportunity to kill it is the risk.
If the desirable outcome is allowing players to finish games reliable when ahead, i don't think that goes in favour of the design of the game. I think that has to be done by VP countdown.
This is more so for a CoH3
Performance and cost on heavies are fine IMO. I'm not saying to push them as back as before (13 CP) but a middle ground and/or having a construction time would go a long way.