Why has Tank role become unpopular again in 6v6?

When 6v6 experimental playtest was announced, everyone was so excited to duo Tanking again. When 6v6 came, the queue time for each role looked rather fair. I see people pick nostalgic Tank duo like Rein + Zarya, but not so much for Winton + DVA.

But now it goes back "<1 minute" for Tanks, while other roles have like "<10 minute" queue times. Throughout my games, I mostly get Tank players who pick Doomfist, Zarya, Hazard (cuz he's still new) and Sigma in like every game. Strangely, quite few people pick Hog & JQ despite they both are pew-pew Tanks, while everyone says JQ is so amazingly fun to play. For the rest of the Tank cast, they appear occasionally.