Tracer seemed like a one-dimensional character, because the audience was only exposed to one side of Tracer's personality, the "hero" aspect.
Outside of a brutally short backstory of Tracer warping in-and-out of existence, nothing much is shown about the character.
Tracer is only seen in battle, fighting the "good fight" and thwarting the evildoers.
Emily's reveal could've paved the way for the writers to make Tracer a more deep, complex, and relatable character
IF they had made Emily a character. Emily, at this point, is nothing more than a plot device to reveal two things: One, Tracer has a significant other. Two, Tracer is bi-sexual or lesbian. The kiss they shared in the comic feels no different than a kiss on the cheek a relative would give while visiting.
It would've been much more interesting to see the strife in the relationship, how Tracer would cope with problems both in-and-out of home, to see the two grow off of each other, and to see their relationship evolve and mature to a point where the audience would see that kiss, the climax, the catharsis.
The build-up is what's missing, and as a result it feels like wasted potential imo.
One can only hope they do things differently for Reaper's Arc, because in that ONE panel Reaper felt more relatable than Tracer did in eleven pages.
Seriously, whoever the artist was for that panel, kudos to them.