That's just wrong. There are plenty of top quality RTS that have no customization systems. Star Craft, War Craft
Arcade / UMS / single player in SC2 (kind of not related to the point, I understand.)
the entirety of the Command and Conquer series
Generals had generals and general points, Red Alert 2 had different nations kinda like AoE2
Grey Goo
Top quality? More like top kek LUL
Age of Empires, etc.
JAPANESE TREBUCHET > ALL TREBUCHET. MONGOL CAVALRY ARCHERS OP PLS NERF
Edit: Actually, I think a huge change up is upgrades vs customization. A lot of those games have upgrade paths to choose from, but CoH2 doesn't... really have them, at least not to any considerable extent. There should be more stuff at default IMO, like all Grens should be able to choose between G43 and LMG, and Conscripts should have a single DP upgrade, armored skirts global upgrade from base costing munitions, tungsten rounds for USF AT being a late game upgrade instead of an ability, and so on.