I agree with your opinion. However, these adjustments require some work.The cav rifle is basically armed with an m3 grease gun. I think their armament needs to be adjusted to m1 carbine. Are you thinking of the idea that the Ranger can help with the lack of anti-infantry capabilities to the rifle company? If so, I agree. Your opinion.
And for Heavy cavarly, I thought the Cav Rifle was pretty much needed.
I've thought the Cav Rifles are thematically a slam dunk for Heavy Cav. They would also help to make the doctrine stronger in the early game. Rangers come very late. But CAv Rifles + off map smoke can make some noise.
I also don't like the fact that Heavy Cav combines the only heavy tank for US with an elite infantry unit. Pershing with a minor buff + CAv Rifles will already be a strong combo.
And "combined arms" could use some tweaks. Its barely used probably because of the high munition cost. Maybe lowering the cost (and the performance) would help.