Outrageous comment speaking against the wisdom of the masses (which is derived from a handful of streamers). I agree, if a is free and you hold b already, cap it. Push the enemy back towards that c/b zone and farm those points. The problem comes when people cap the zone and camp it. If you get a 2 zone advantage on that map you need to press the enemy and capitalise, especially if it's a/b under control. Honestly people who complain about capping a are probably the same ones who end games with 30 kills and 1 capture. Not in all cases, but most, I suspect. Harms their kd if they don't know an enemy might be approaching from behind.