Tanks are the Hard carry

Or you could run Sigma with Zarya or Hog, or run Ball with Zarya. I have even seen Dva and Zarya work together. It depends on skill with the heroes

Fair point, but those are kinda trash on Defense.

True, defense almost always requires a barrier

You mean a Rein or Sigma/Orisa

Yeah, Winston doesn’t work too well

Neither does Sigma+OffTank or Orisa+OffTank.