hit the nail on the head luca.
NOS was traditionally used to eliminate low rpm turbo lag. These days on modern turbo engine lag is all but minimal.
The GTI boost comes in so low I dont see the need for NOS at the bottom end.
In fact it would make the car less driveable with immediate low rpm torque just spinning wheels...
However with a progressive controller , I do see a need for top end HP
I can see a huge benefit for BT guys though to get up to the spool point quicker