One of the reasons the main reasons rifles are so constantly spammed is because the support unit; the rear echelon lacks functionality for the front line. Yes they are support units and not combat units, but neither are pioneers and they are thrown into the fray. One of the main reason echelon troops aren't built is because all usf vehicles come with their own "engineer squad". Because of the high potency and all-around utility of rifles i believe this change would help a lot in balancing the faction so that it could function more along of lines of the ost, british, and soviets. In order to give the player a real-time serious incentive to build echelons, abilities need to be shared.
This is in fact why the usf mortar was introduced...to be blunt, players were just bored. Now the usf have two low tier units with high firepower that both have the ability to cover each other with smoke.
The soviets have an Elite doctrinal infantry unit with smoke. Shocks.
The ostheer dont even get smoke on infantry, just on their tanks, and that to is doctrinal. That's how powerful this ability is revered.
Look at the usf, its given to entry level units...a Juggernaut like riflemen should not be able to cover themselves with such a powerful ability, it needs to be given to echelons.
This change will force combined arms use and make echelons a crucial factor in the usf infantry line up. It will also end the spamming of riflemen due to their self-sufficiency to overcome any obstacle...which, isn't right.