Tracer Missle vs Snipe:
Tracer Missle is spammable w/o heat problems
3 Snipe gets you below 60 energy thus giving you problems
Tracer Missle require no cover
Snipe require cover, cover has a delay bug, thus less dps
Tracer Missle is kinectic damage, thus unblockable
Snipe is physical, it gets migated, deflected, dodged etc
So, Tracer Missle is spammable to infinity, without being ever deflected and require no cover.