With the current playstyle of the rider class it is very restricted and defensive.
It has the speed to set up engagement but since this class is following the rule of engagement of a regular army, its potential is very limited.
But what if the rider class has lesser map movement restrictions just like the partisans, this class can shine more, like a better hit and run approach in a aggressive way.
And for the engineering with this class, the rider class can build but within regular army map restrictions.
These quads need larger bsse sizes to be competative, not the ability to be another squad terrorising the enemy backline.
That’s the utility these squads need, the ability to place your mixed choices of AT gunner, MG gunner, Engineer, Radioman, Medic, or Assaulter anywhere on the playable map on short notice, without having to do a risky para-drop.
I agree with you @OggeKing the main problem holding them back is the small squad size plus two soldiers for 5-6 man squads would make them a lot more playable.