If so, why? I personally think it would be fine, and here are my reasons why. In Crucible, you would either need to collect heavy ammo, which happens rarely, or collect special ammo for Ergo Sum, which only drops from players who are holding it. Then, guard resist against players is much lower than combatants, and not all weapons or abilities are projectile based, so less to deflect. In Gambit, your time as an invader is much better spend chasing players rather than hiding and spamming guard. Swords are also less effective on the larger maps and for the aforementioned reasons for Crucible. In PvE, this makes swords a little more viable as you could use them both defensively and offensively without having to close the distance.