So 3-peeking is using anything that forces the camera in the normally 1st person Destiny experience to be 3rd person, giving good PvP players an advantage by being able to see around corners safely. At this point two things trigger this: Swords and Emotes. https://twitter.com/IFrostBolt/status/1354992108495659010

One suggestion is to remove emotes entirely, or to force players to sit through the length of the entire emote. People like emotes in PvP for taunting, so that won't work. Some emotes loop, so that won't work. And some emotes have a "join" stage, so those won't work either.

Swords are rare - they're "heavy" weapons that rarely have ammo in PvP matches. One suggestion is to make swords not work unless they have ammo. That would block any non-heavy swords from being created, prioritize heavy in PvP, & leave the game assymetrical if someone gets ammo.

There's a ton of additional problems: there's currently no first-person camera/animation/assets for Swords, and the uncontrolled switch from first-person to third-person as you grab ammo might be unpleasant around frequently contested heavy ammo drops.

Right now, I think one issue is "bringing a Sword" not only gives the 3-peek advantage - they're also just really effective weapons. It's not "a loss" to bring a Sword rather than say, a rocket launcher. which can't 3-peek. So maybe that advantage needs to be 'balanced in' a bit?

But then again, the group of players good enough to get a strong advantage from 3-peeking is so small that making Swords worse for everyone just because some top-level players can peek around a corner with them? Seems not great.

And for the emotes? They're balanced! Everyone has them - but 3-peeking does genuinely allow for field advantage or weird stalemates. The only suggestion I've seen that might be realistic is to disable the PvP radar during an emote, which adds some additional risk/reward.

Anyway, it's a really fun design challenge for what is genuinely a relatively minor problem, but even then I don't see any solutions here that would not worsen a ton of people's PvP experience at the behest of some very dedicated PvP players. Tough one.

I continue to believe Destiny is one of the hardest games ever to be a developer on.

I have now spent an hour discussing possible options with folks in the comments and I apologize to any Destiny designer that's looking at this going "we thought of ALL OF THAT but here's how we spent two weeks of work just to learn it's a bad idea"