If you do nothing but spam Tracer/Gravity you are really really bad at your class, and if you die to someone doing that you are even worse. What you should be doing is tracer, tracer, tracer, HEATSEEKER ((Which btw does more damage then tracer missile.)), tracer, tracer, RAILSHOT (( Again, more damage then tracer missile)), throw out unload on procs.
What people fail to understand is we have NO CHOICE but to use the move between Heatseekers and Railshots, since it builds up the buff to them. Trust me, I would LOVE IT if powershot did the same thing as tracer missile, I could actually use my guns, and you know what... powershot also hits harder then tracer missile. So go ahead, share the buff between the two, and nerf tracer missile, I will gladly start using powershot which hits quite a bit harder and then you can be happy the tracer missile spam is gone.