You cant really apply that much pressure that early on. Its not like your units are roaming free on the map, there are still Sturmpios, Volks and MG's.
Concentration of forces is more important. Two squads will always force off one squad. Having more squads and making smart movements allows you to gain map control and push your opponent off. Every retreat is a minute long before that unit is relevant again.
It's like the DoW2 meta, itshifted from quick T2's to prolonged T1's because players learned to take advantage of stronger unit presence in t1 to cripple their opponents economy, while being able to deal with whatever they fast teched to simply by waiting it out for a minute and building the necessary counter. It took years to come about and some pioneering from some great players, but the idea of rushing t2 has been pretty much been eradicated in high level play. Instead, you teched based on how much you observed your opponent spending his resources.
The game is young. The expansion is younger. You'd be amazed how much the metagame can change over the years even without any patches. People learn to play better. I can name dozens of things that people used to consider unviable, impossible to micro or ridiculous that became standard play in DoW2 in the last 5 years. I've seen it happen with other games as well.
Kneejerk reactions are bad, mkay. You end up like Riot and have an awful back and forth seesaw of balance overreacting to complaints.
I'd argue if there is any meta yet.
Most players still experiment and its quite likely there will be a balance patch month after release, which might adjust things that couldn't be caught up in alpha.
I've seen as many BOs as I've met players(except for USF, who really are less flexible in BOs then soviets were at their worst).
Eh, I think people could do some cool stuff that doesn't involve riflemen. For example you could build a bunch of rear echelon guys and then abandon all your vehicles to get the tank crews and crew them with RE. Seems like it'd have potential with the armour doctrine and weapon racks.