Ok I'll bite.
You need to sink the ball into the sponge to generate an increasing normal force on the ball in order to engage it with high friction (similar to locking in gears) - after engaging it then the tangential force can spin the ball hard.
When going against the spin (topspin vs topspin), the problem comes when the ball already has an immense amount of spin on it and you're trying to forcefully brush it instead of allowing the rubber to do its job to reverse the spin. What this leads to is a very high amount of ball tangential speed relative to the racket (100 + 100 = 200) in your example, which happens before the ball is sinking into the sponge. Because there's not much normal force at this point, there is also not much friction capacity so it's easy for it to just slip off resulting in a bad contact. So for control, it's better to focus on a thicker contact to sink it into the sponge and let the inverted rubber invert the spin much like a tangential trampoline.
But however, if you're doing spin continuation and forcefully brushing (for eg with topspin against strong backspin), the tangential speed of the ball relative to the ball is low (105-100=5 for example), which reduces the frictional demands of the rubber at the beginning stages of the contact before the ball is sunk into the sponge. This allows you to brush hard and still maintain control of the ball.
The idea, of course is that if you're doing spin continuation with inverted rubbers you should be brushing hard to at least match the incoming ball spin, but if you're going against the spin it's better to let the rubber do its job of inverting the spin and focus more on controlling and carrying the ball to where it should be.