There are other match ups for a rein than an enemy Rein, and the issues are not exclusive to Rein. Tanks get shredded by the sheer amount of damage, damage amp and CC, hence why WB is so strong now and hard to kill even through CC.
Just viable is not enough. Technically everything is viable, but there’s currently so little between a tank hero being viable and not viable. There’s is so much damage and damage amp in the game right now that tanks simply do not feel like tanks if played against an enemy who aren’t picking their noses instead of shooting. A fact is that tanks got significantly worse than they used to be. That’s not a matter of opinion. They just don’t have the impact they should have and used to have in the past.
It’s not just a matter of some mid-game rage or a few people being dissatisfied. It’s across all ranks. You are right now genuinely the only person I know of who is fine with the current state of tanks. Even non-tank players see it, including myself, although I do play a fair amount of tank as well.
There’s a nice topic about this: