What’s with the common misconception that Tracer has the lowest hp in the game. Hanzo, Nova, Li-Ming, and Probius all have lower health pools than her. (That’s not counting Eric, Baelog, Abathur and Murky as well). For reference Valla only has 10hp more than her as well.
Considering she gets baseline lifesteal and a very strong defensive talent as early as level 4, I would say her effective HP is pretty good actually. The whole “just AA her” isn’t really enough to scare after the rework (due to sustain) unless you’re actually an AA hero.