As someone who has tested in this in Overwatch, Tracer’s falloff range is NOT a problem.
In fact! I’ll launch Overwatch right now to test it as I type this.
And we’re off!
Area used for testing: Beyond the 2 (firing) Enemy Bots, to the right (from spawn). There is a 40-meter strip that is labeled at every 10 meters. I will be using this for testing.
How to Replicate:
Go to the above location, stand as close to you can to the middle of the line.
Aim as close as possible to the Enemy Bot’s center. Not their head, not their arm, the center of their torso.
Shoot at listed distances.
[Anything under 12 Meters] =One-Clip (centre of body)
[12 Meters] =One-Clip (centre of body)
20 Meters + One-Blink (forward) = 40 shots
 Meters =One-Clip (Center of head)
Halfway 30-Meter & 20-Meter = 40 shots
[13 Meters] = 1.3 Clips (center of body)
3 Railings away from the 20-Meter line (forward) = 52 shots
[18 to 19 Meters] = 1.8 clips (center of body)
1 Railing away from the 20-Meter line (forward) = 72 shots,
At [20 Meters], 2.75 clips (center of body)
Interpreting Data: For each corresponding number on the list above, there will be the estimated time to achieve said-result given the fact that Tracer uses up 1 clip every 1 seconds.
Your stats are nice, but useless, they are theoretical.
There is no way a Brigitte stands still, and she has her Shields most of the time, and you haven’t calculated her current armor, aswell as her self-heal in.