As we know, battle royale gameplay is currently in vogue. I would say though, this game mode by itself isn’t as fun as core Halo gameplay (with respawning/faster paced action/more interactions with the enemy/etc). I do think H6 has an opportunity to include it though.
Could imagine a Warzone gamemode for example, where it’s WZ as regular - fast paced action, lots of activity, then at the end it transitions to battle royale - field goes quiet, and now players are much more methodical. In general, having multiple objectives/gameplay styles within a single match would be really incredible gameplay experience.