There comes a point in the development of every guitar player when they realise what it is they need in a guitar in order to fulfil their potential. The requirements may vary from player to player, but I would suggest that almost every guitarist could benefit from playing a guitar with a wider neck than the standard 1-11/16" nut width. 1-3/4" is good and 1-13/16" is even better.Paradoxically, this benefits women, with smaller hands, even more than men.
Tony McManus (the world's greatest guitarist) attributes his development largely to his custom-built guitar.
Murray