I have never shifted a T56, but I have shifted plenty of rail shifters, they ain't better than a fresh A833 setup. When I got eh swap done in my 87 Diplomat I could shift with two fingers.
It's not the shift quaility when driving slow. Even the Fuller transmission in my Class 6 International Harvester truck can be shifted "easily" for a slow rpm matched shift.
We are talking about kicking the clutch and tugging on the shifter at full throttle. An 833 is similar to a truck transmission and a T56 is more like a dirt bike when it comes to finding gears while racing.