Tremec TKX first cuts
I advocate for the upper support. But many do not use it. People have likely driven thousands of miles without it. The transmission mount does give support back when bolted tight. If the problems were immediate we would certainly of heard issues by now.
With that said. What I see potentially happening is over time the torsion bar cross member 1/2s now being able to flex. This could result in metal fatigue causing cracks where they meet the floor and frame rails.
If this happens it will take more time to repair over just adding the support to begin with.
The SST pedals look like nice pieces. Are they bearing or bushing?
I think I want to order the chrome pedal bezels too.