Would Horizontal Progression Help this Game?

[seraf]

Horizontal progress only works in the days before BIS web sites and theory grinding.

I've never played this game before but I've been told that Guild Wars 2 has Horizontal progression and it works out pretty well. I can't verify this though as I've never played the game myself but if it's true then the formula can still work in modern MMORPG's it would seem.