That’s less of a “more tanks users” thing.
And more of a “I don’t think devs have the systems needed to deal with low barriers yet”.
OW2 PVP, Low Barrier problems
So it’s easier to make Orisa and Sigma barriers more similar to Rein. And some Winston, because of the Dive at high tier. Which gives Plat and below a lot of SingleBarrier Tank options to work with.
(Which is LONG overdue for Plat and below)
For high tier, the reason for Dive, is because you want to avoid DoubleBarrier Rush. Which leaves pretty much the only close range comp being Dive.
That said, again for high tier, I think it’s a lost cause to get them to play more than 8-10 heroes for a given patch, once the meta has been “solved”.
For that you’d need something that’s equivalent to a ban system.
Pick system, instead of Bans