As someone with 100s of hours in SupCom and 1000s in SC2:

SupCom is interesting to play and boring to watch. Tier 1 rushes are map specific to your point… but then Tier 1 units are irrelevant.

Risk would be similarly boring to watch. It’s not that it’s a bad game (quite the contrary).

Blizzard has to balance the meta as the meta is so extensively studied - because it has an audience.