The empulse transmission is more in the concept of a bicycle gears than a car transmission.
On a bicyle, do you "need" 10-12 gear? No.
1 is enough to get you going. Just need a tall gear to have the same top speed because you're RPM limited & a bigger pair of legs to have the same wheel torque as the lowest gear.
Do you need to run through all of them? No.
You just pick the one that suit you most and go with it. Yes, 6 gear is probably 3 too many, same as a bicycle.
For me, I have a 42T so
1st gear is for street ;0-80km/h, 90% of the time .
2nd for boulvard 40-100km/h,
3rd for highway ramp,
4 for highway
5,6... getting to 170kmh or "hypermiling"
A single gear need at least twice more Torque at the motor shaft to have the same wheel torque as a mutli gear in 1st. Give me the same wheel torque than a multi speed with a single gear and I choose the single gear. Until a 150lb-ft+ single gear is available, I will stick with a tranny.