Tanks are screwed

With the unhealthy amounts of true damage, % max health damage, ways to bypass armour and MR, tanks need an item that provides damage reduction, issue is that if they give that to tanks, other champs WILL abuse it and become even more unbearable, so how is a tank supposed to tank when people go through them like a hot knife through butter?, If i have 400 armour as malphite after my shield drops vs a full ad team and at 3.7k hp...i should NOT be blown up in 2.34 seconds by just 2 people. Riot's recent changes have all been to add more damage to game with no way to counter it outside of building more damage than the enemy team