Tank is not weak right now, you are just biased.
Outside of a few outliers, (Thor, Strange, Dino?) every tank is viable and most of them are very good. Groot, Magneto, and Deadpool are picked every game and have little counters as the meta favors them. Thing, Emma, Venom, and Peni (hot take for some reason) are also very good and slottable on most maps. Angela, Hulk are also still good and are amazing into dive (which isn’t as good so is the reason they might struggle) but otherwise are perfectly viable. The only tanks which are genuinely not viable this season are Strange, Thor (never been good so nothing changed) and Dino (which is a ? because barely anyone is using him since the patch.) Cap and Rogue are 2 tanks which everyone has been saying are dogshit and have no use cases, which definitely is not true. It’s not the meta for these 2, and they also aren’t overtuned, (like venom and thing) so it actually does make a difference, but they still sit at a solid low b tier and a couple nerfs to other characters next patch and they would definitely be competitive. If you disagree with anything i said say so.