I have a 27cm width board (because of size 13 boots), but does it really affect your ability to turn that much?
How much difference does say a 25cm to a 27cm (2cm difference) make in performance?
It's a bit like say size 13 shoes suck. They might be a pain for someone with a size 8 foot, but a size 8 shoe on a size 13 foot would be ten time worse. Narrow boards on big feet don't work. That statement is typically made by someone with an agenda. Many manufacturers unable to make wider boards have made such a claim.
I have size 11s. I have a regular and a semi wide board, difference is 0.5cm at the waist.
It is definitely slower edge to edge but its a very small difference. The width also gives a little extra float in pow.