3-D maneuvers don't "requre a violent stall". Quite to the contrary, 3-D maneuvers require that you pass through stall to vectored thrust smoothly and quickly.

Think about a wall. If the airplane was heavy and stalled violently, you'd yank on the elevator and the plane would snap out on you. What you want is for the plane to immediately stop flying on the wing (passing through stall speed so fast there's no chance for differential lift to rotate you) and start flying on the prop.

Same thing with a blender, one of the most violent moves out there. You go from a spiral dive (aileron dive) to immediately way past stalled and quickly back to stalled again.

If the plane "stalled violently" you'd go from a spiral dive to a snap roll instead of to a flat spin.

And how about flying the airplane backwards? No violent stalls allowed!