What is wrong with tanks and survival these days.

Or, why do tanks blow up as carries do?

Actually , that doesn't happen. Survival items do their job properly at keeping people alive. Tanks will go down under a costant dps from the enemy adc, that's the natural order of league.

Then why are people complaining so much? Well, a number of reason. First, the dragon buff favors AD and AP over tanks. No "buts". If you have 300 AD, and I have 100, you gain 18 BOnus AD while I gain 6. There's isn't much to discuss, it's just made to promote offense over defense, it's working as intended.

Second, AD itemization it's not specific, it works well as item are effective all around.

Hey, I'm Veigar , I'm a burst mage, and because of that, I build , an item made to deal a significant damage against health stackers.

Seems silly,right? :D

Hey, I'm Zed , I'm an attack damage assassin, and because of that, I build , an item made for fighters to deal significant damage against health stackers.

That still seems silly, but the problem is: it works. Same with most adc really, their building Botrk to deal against tanks or fighters with tons of health doesn't impact significantly their damage against low health targets.

Third, last whisper works too well against squishy targets and synergize too much with blade of the ruined king. You remember the Vayne problem? That when Vayne is too strong in a certain meta you can't itemize against her because of percentage of max health true damage? Well, Botrk is really similar, once you have last whisper. When the adc, or assassin, has both items, you can't itemize effectively against it. Armor gets mitigated, health increases the botrk damage. Also, as with blade of the ruined kind, while Last whisper is made to counter heavy armor targets, it also works well against low armor targets.

In short, while an Ap champion builds item to be effective against a certain kind of target and lose effectiveness against others (example: Rilay and Liandry to counter assassins and deal damage to high health targets, vs DFG and Rabaddon{item:3089}} to deal massive damage to squishies, etc. etc.), an AD champion with the same build keeps high efficiency against all sort of targets, since most of his itemization is not specific and works well around. You build an IE, then a Botrk instead of a BT, and a last whisper, and you deal massive damage to both squishies and tanks. While it's true that void staff has some of these issues, magic damage is gated by cooldown , while auto attacks aren't.