I’ve been thinking the same thing for a while, Counter-Skirmisher should be like Skirmishers but with a slightly lower bonus against heavy infantry and light cavalry, in exchange for having a bonus against Skirmishers. The current design doesn’t make much sense from a historical perspective, for example the Pandours were famous as Skirmishers, not Counter-Skirmishers.
I would like the devs to rework the Rodeleros to be Shock Infantry, this way they would not have the same role as the Pikemen and thus most units that use shields would be Shock Infantry (Like Coyote Runners, Chimu Runners and Rattan Shields), which would be nice in terms of clarity, but I have a feeling this move would be very unpopular. Maybe the Rodeleros can be Shock Infantry but with less base damage than others in exchange for having a small bonus against heavy cavalry, but anyway, a change like this would have to be well thought out to be successful.
I think infantry using pistols (Pistolero etc.) should be like Zouaves, with a good ranged attack but no bonuses against cavalry in melee.