Well, sure. Heavy Gauss is all you get.
Any army that has the choice, in any case, should go both roads: the heavy dude, vehicle kill stuff and lighter but more numerous suppression fire. You need both to deal with mech. Melta/other ap1 stuff is your reset button, but keeping stuff shaken/upset and getting rolls on the table is a huge boon as well.
Her(?) name may be slightly inapropriate, but she just needs love! And I just need to eat your face!
I'm probably going to follow my usual Eldar tactic of driving around the table "circling and screaming 'I don't give a fuck' with my windows down and system up" and avoiding anything that looks scary.