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The purpose of this patch is to create an as large amount of middle ground (good/viable) commanders as possible to increase commander diversity. Not to create more top meta commanders. Heavy Cav is already nice and comfortable in the middle being 4th most popular in 2v2, 3v3 and 4v4 and it's getting a few nice buffs too (3 medium-small Pershing buffs, cheaper offmap smoke, Rangers will get a small buff). And some heavy meta commanders like Mechanized are being nerfed. And it being picked less than Urban Assault in teamgames for example has less to do with Heavy Cav itself and more with the Calliope being a necessary tool that more people prefer. There's no need to turn the Pershing into some kind of monster just to make it the number one pick. We're trying to move away from number one picks.
Very good to see that both in the patchnotes as well as in the forum discussions a lot of information is added about what the goal of the patch is in addition to what the changes actually are.