Cav archers will beat cuirs, they are the only anticav that doesn't need a HUGE amount of micro to kill the cuir. it's the 30% melee resist and the fact you can mass them.
Black riders would be great anti cuir units but cuirs can simply swamp the black riders, you can only micro your black riders for so long until you start to need to micro elsewhere...
So solving something by microing better is only part of the solution because a very determined player can keep those cuirs pressing your black riders to the point you have to eventually take your eys off them or risk being attacked elsewhere, once your riders are gone then what.... Dragoons? Ruyters? I'm sorry but the sheer amountof goons and ruyters it takes to fend off a mass cuir attack is something no one can micro... killing 20 cuirs is simple with micro... killing 40-50 is NOT simple and in most cases poor pathing will result in cuirs killing you WAY faster than you can kill them.
And don't bring your goons in confined spaces like trying to defend your city, then cuirs WILL get to them easily and smite them with great vengence and furious anger.
40 1000hp cuirs with 70 attack is NOT something a dragoon force can stop... even with a meat shield.
TGE