REMOVING SKIRMISH FROM DESTINY 3V3 WAS A HUUUGE MISTAKE. GAME COULD BE ALOT MORE POPULATED IF YOU BRING BACK SKIRMISH. SKIRMISH IS THE ORIGINAL SWEAT PLAYLIST. SWEATS STARTED FROM SKIRMISH 3V3.
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You know, on the Shadowkeep Vidoc they had a short clip showcasing a 3v3 mode.
For instance, at 8:30 on the video. One of the Bungie employies states, as a loading animation of 3 people is played: "We're updating labs to include some much loved gametypes from the past." Check it out for yourself if you wish.
Edit: Also, at 8:08 there's literally a screenshot of a classic d2 face to face animation with $GAMETYPE_ELIMINATION$ writen in the bottom right corner. I can confidenlty say your wish will come true.