During the ZOE helldays, VS MAX's weren't used that often by that many people. But it was the impact it had, rather than the amount of players using it that mattered. If a single player uses a certain weapon only once a day but it completely screws over one faction, you can still claim it doesn't impact the meta "because too few people are using it and not much". But how much it actually impacts the meta is important here. Even a single Starfall Flash between a bunch of vehicles often has a massive impact on the battle there. Vehicles that would normally have survived and repaired up are now destroyed, the extra damage one of these does in a single moment against opponents can completely change your stance from "I'll have time to get to cover/beat this enemy" to "holy crap I'm dead now".