Skidpan.
I dont doubt that VW spend millions on R&D.
They build cars however for the mass market, You could use your very vague and wide ecompassing argument on anything.
"Dont change the suspension, They've spent millions developing that. Some bloke in his garage wont be able to create BETTER suspension."
Its total tripe, They built a generic map, to suit all weather conditions and all fuel grades across Europe and its surrounding nations. As such the car is limited for reliability and other reasons.
Revo/APR and other major players in the tuning world are not "A man in a garage" and I think they'd probably find your comments stupid and quite offensive.
Dealerships now offer remaps off the forecourt, so either the remap slows other people down, Or it is infact enhancing the performance of my car.
So you have someone vouch that their remap didn't enhance their car, either their entertaining you because your clearly mad, or they had a shitty remap that didn't work!