Fix your game Riot

I'm not here to complain about queue times, games modes, and different queue types like many other people. What I'm concerned about is the gameplay. How is it that these champions with 2000+ HP going all the way up to 4000, 5000 HP are able to do so much damage, but be so hard to kill? I saw a Nautilus build full AP and still he was unkillable, yet he was shredding me and my team. Then there's Darius and Swain, both champions who destroy teamfights, yet just don't die. There's many other champions who are able to do these things: Ekko, Fizz, Akali, Illaoi, Tahm, Yi, pretty much anyone who has some damage in their kit can build tanky and wreck. I recently played a game against the first three champions I mentioned, Darius, Naut, and Swain. Teamfights were impossible. Not as simple as "target the carry", "target the adc", when the adc is doing the least damage and the carries are three dudes who have 2000, 3000, 5000 health. It's insanity that they're able to do this. Even though naut had only around 2000 HP, he took no damage, so not like the "low" HP really mattered that much. There is no way around these huge "tanks". The only possible way to win against a team like that is to pretty much stomp them in like a ~20 minute match. However, when you're playing with a team of people you don't know, who don't always communicate, and may have no synergy with you, especially in low rating, it's just not going to happen. By the time we got like 25 minutes in, the game was other. Trust me, we all kept trying. We were getting picks, and didn't try to surrender until way later. But the picks didn't matter at all, because all they had to do was just take objectives until we fought them. Every time we fought past that 20 minute mark as a team we lost. I've played many other matches lately that have been like this. I used to love playing squishy, high-risk, high-reward builds and champions. Now they're practically useless against all these tanks who do just as much damage. It's at the point where the adCARRY is being outshined by these tanks. The damage the "carry" is doing is nothing compared to the tanks. It just seems so wrong and messed up. Please Riot, do something about this.