It's not the heavy or invasion that turns gambit off for me, it's the stupid DPS gate and healing. Just give the primeval a ton of hp like the rest of the mini raid bosses on the map and which ever team kills it first wins.
Once the invader wipes most of the team to make the primeval health from 25% to 100% it's giving up time for me.
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This ^ because gambit is meant to be both pve pvp Killing guardians should just slow then enemy team down no healing the boss just give it more health