Tanks haven't been relevant for about 3 years in the top lane.
Love him or hate him... he describes it perfectly:
https://www.youtube.com/watch?v=sFj7Ag2esAE
Maybe you would have a point but you sound extremely stupid if you call ANYTHING in the last 3 years "League of tanks". The art of soaking damage is LONG GONE. The only tanks you see in the top 20 Top Lane champions are ones like Ornn who can deal an absurd amount of damage. If it doesn't deal damage, it can't top lane anymore.
Top Lane is dominated by BRUISERS and FIGHTERS. This has been the case for 3+ years. Hell, even in the notorious "tank metas", old Fiora and old Irelia were still the preferred god tier picks for Top lane solo queue (use https://archive.org/ for reference). Top Tanks could still at least do their job when it comes to peeling or SOAKING DAMAGE back then. These high health champions you see in Top Lane aren't tanks. THEY ARE CALLED BRUISERS. Huge difference...

None of these champions are Tanks ;-)
There are only four champions CLASSIFIED BY RIOT as tanks in the top 20...

-Singed no longer functions as a Tank. He builds nearly full AP
-Shen most commonly builds Titanic Hydra as a first item. He functions more like a bruiser.
-Ornn actually functions as a Tank, but he can't rely on his damage soaking. He relies on his absurd damage.
-Malphite can't rely on damage soaking. He relies on his team to win or go even early so his team can bail him out of lane to ACTUALLY make use of his ultimate. He also builds AP first in many matchups because his ability to tank is so useless in them.
When you complain about tanks, you aren't actually complaining about TANKS. You are complaining about high health bruisers/fighters. This distinction is VERY important when identifying what the problem is. If everyone complains about Tanks to Riot, Riot will have more incentive to keep an already irrelevant class useless. This is very bad. I wouldn't mind it if they were useless for a year, but 3+ years is really testing my will to continue playing this game since the Top Lane meta has barely changed in many years regarding the class of champions that can lane Top.
I also see a lot of ADC's complaining about how useless they are for the last several years. Want to know what makes ADC's more useful? Tanks. Want to know what makes Tanks more useful? ADC's. They compliment each other. However, when every class in the game can easily blow Tanks up, there isn't anyone who can protect the ADC's. The only way ADC's can perform in a meta full of Fighters/Bruisers/Assassins, is to over tune their numbers so that they can have Assassin-like damage. ADC's need to be able to deal large damage to high health targets, they need to not be able to kill squishies in 3 auto attacks, they need to get heavily out-bursted by Assassins, and Tanks need to be able to soak damage long enough vs non-ADC's to allow their own ADC's to actually get damage off. Assassins and Fighters SHOULD have to worry about Tanks being able to soak enough damage to peel for their ADC's which forces the fighters and Assassins to be more selective about their engages. Instead of being able to just engage on the Tank and blowing it up like it is nothing.