A bit of context here can help explain. The reason that full minstrel Chrono support is the only acceptable build for WvW group fights is because mesmer completely and totally incapable of dealing anything that even kinda looks like meaningful damage. You could be in full zerk and be the best mesmer player in the game, and a herald in Marauder's gear that started last week will outdamage you with ease. So, you don't run damage. Unfortunately, you can't actually support either anymore. Used to be that Chrono provided boons. These days...not so much. You go minstrel anyway because then you can't die, and you use focus pull, gravity well, veil, and illusion of life as appropriate. You're basically a utility totem in a really tanky suit.