I sometimes find this kind of thing hard to believe.
If you let go of your controller... you lose control.
So why let go?
Return to center springs are merely to assist. The sticks are not really designed with the purpose as to be flung, then let go.
(with the exception of the single direction sprung mini analog baseball style controllers)
Yes, you can add a heavier spring (or stretch the existing spring) ... but thats just going to create added resistance that will cause quicker hand fatigue, and slower reaction times.
Supers are designed with a lot more friction, so will be less prone to being as springy. However, again, is makes them a lot slower and fatiguing to use. Test this by wiggling the stick left to right as fast as possible for a solid 60 seconds. The compare the same results to a comp. The comp will feel faster and easier to perform the tasks.
The other exception are real Leaf Switch joysticks that use a Rubber Gromet for centering. The gromet is more of a pivot, rather than a spring. They wont spring back and forth. They are a bit more firm... but... they activate their switches with far less stick travel than most typical microswitch sticks. The feeling in much nicer for classics... as there is no hard Thump when you clash into the endpoints of travel. The rubber absorbs noise, vibrations, and excess impact forces.
Wico leaf sticks however, are not that well suited to highly accurate requirements such as Fighting games.