Paras? Meh, you have LMG.
Infantry for LMG and arty? Meh, you have LMGs and better arty.
Quoad for extra pressure and really long recon.
And at the top of that, calliOPe.
Once we were afraid that we gonna see E8 every damn game. Then we were afraid of Pershing every damn game. But other commanders offer different/better/more important abilities than these 2, that's why we did not see them all the time. Once it was Rifle Company, then it was Pershing or Armor company. Even infantry was very popular. But right now? It's calliope commander every game. From 1v1 to 4v4 vast majority of games is about this commander. In late-game you just abuse pop cap and spam calliopes like crazy (stop cooldown when crew is out, anyone?
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Well, GG Relic for making commander which owns all others commanders. You brought to the point, where all you need is calliope commander, nothing else.