I'm against hand operated front brakes in Rotax.
Just a few reasons:
- They add cost.
- They add weight.
- They make it more complicated.
- According to some, they take away driver skill on corner entry.
- There's been no need for them, why now?
Additional cost means less karters, as does things being more complicated - how natural is it for a newbie to brake with his foot and his hand? It's not just driving that seems more complicated, it's also kart maintenance - now you have 3 sets of brake pads that wear out.
They were introduced for KF1/2 I'd think because the weight of the karts went up while the top speeds stayed up. Maybe only rear brakes were considered not enough? In Rotax racing rear brakes have been enough since the category was introduced, there's no need to suddenly start using them.
Anything that makes it more complicated or more expensive for the newbie particularly is a bad idea.