Why isn't Jeweled Gauntlet a problem in TFT? Don't some champs only get their ults off once? If that crits, suddenly the entire team is gone. (I don't play TFT so I'm ignorant but Cho'gath Q for example looked like it would be problematic if it crit)
TFT is innately more random and crit damage is 1.3x baseline. Even if you crit it’s less damage than an item of similar power (Deathcap) unless you build into more crit.