As a lifelong tank main in just about every game that lets me do it in any capacity... Yes. This.
I come back after a year or so out of the game and I find that carries can melt my tanks like they're nothing. It doesn't matter how many resistances I have. I've had 400 armor and died pretty damn quick to a late game Cait. I can still survive for quite a while if I in-and-out it. Drop some CC, take a couple hits, step out, and repeat.
The problem with that is that tanks are meant to hold their ground. If you're not standing firm at the front line, taking all the punishment, you're not a tank. You're just a skirmisher with a lot of health. This needs to change pretty badly. (Also what's the deal with tank masteries? 1.5% of your total health healed every four seconds in combat? If you have 4,000 health, that's a whopping 60 health, when you're getting chunks of 100 or more ripped off every half-second by the enemy ADC.)