Well, interesting exchange of arguments...
Myself I've found SC to be just "not good", that means I don't use them often, but neither do I find them "absolute crap" as say, Arco Cav

.
So I think I'm more on NGF side (sorry Pocus

). Indeed Pythium is strong in nearly all game aspects, a less-than-average, costly cav is justified. Usually they just aren't needed, but if you have to get a cav corps they'll do it - expensively...
In addition I believe than in 2.11 SC got the "Light Lance", making them a bit more punchy on 1st round of combat, isn't it ?