I also agree that this is a bad poll because the metagame is developed by the players, how varied it can become depends on the map pool and the tools available at the players disposal.
With the amount of viable strats the soviets have at their disposal I think some of the accusations of boring meta are down to players not experimenting enough.
I disagree.
You cast games yourself and you see how much the 2v2 ele-isu fight is fought.
Ofcours all players could abandon the ISU and ele and play other more fun games, but players rather just win than experiment.
'Players should experiment', agree.
But that's not the case and won't be the case.
Players (most time the best and most experienced players) develop the metagame, correct. While doing so they tend to find the most efficient and easy way to beat there opponents because they want to win. So they check out the amount of options the game offers and lean into the options which support this objective at best.
This.
Players make the meta - Yes, but they make it with the tools available.
The OP unit will always be used.