no no no, thats why you build tanky, so you die in 2-3 seconds. squishies just get 1hko and die instantly with no counterplay other than dont get caught. - kappa
its just the hyper damage meta we live in.
people are complaining about dieing too quickly despite building tanky and they never get the opportunity to use their full combo before they die. its not the ADC that kills them but a team that focuses them down and the tank is locked down over anyone else and "you're a tank but still didn't even get the chance to use your ult on the enemy carries" this largely has to do with you trying to walk in from the front of the group (not expecting to take any poke damage along the way), or you find yourself pushed out of the fight, damaged somewhat, and forced to back or guaranteed die next time you try something.
its really just a playstyle factor, you hold on to your things too long looking for ultimate value or the big 5 man knockup, but you are never happy with going 1-1 or 1-2 when that in of itself is desirable pending who you trade for.