I have played since S5 in masters and S6 3.9K and I never found Tracer broken or “the better Tracer wins”. I played during peak DIVE in high masters and never ever have I had a match which was decided by the better Tracer alone.
I’ve had godly Zenyattas, Hanzos, DVas, Widows and Genjis killing the good enemy Tracer. You always had some sort of counterplay vs her as any hero. Even McCrees were used to keep her off the backline. When Moira came out, it took quite some time for the Tracer players to adjust to her, so even in 3.9K SR, Moira somewhat countered her until S10.
It did suck when the enemy had a GM smurf (which happens a lot in masters) on Tracer. That’s not a Tracer problem, that is a smurf problem. But mostly you got compensated with a GM smurf on your team yourself, so those 2 fought it out most of the time. I didn’t even see Tracer in every match, she was in every other match. Genji and Widow were far more popular in high masters at the time.
These days though, you HAVE to have a Widow in matches above mid-diamond and hope she is better than the enemy Widow. THAT is, what a broken hero is like. Widow at the higher ranks CAN ONLY BE COUNTERED by a better Widow.
Tracer back in the day? A same-skilled Hanzo, Widow, Zenyatta, Genji, Mercy (keeping out of Tracers reach), DVa and even nerfed Ana were good counters who had an equal matchup against her. Same-skilled being the keyword here, as I mentioned before, if you had a GM smurf on Tracer in masters, you got wrecked. But that also happened with them on Widow, Genji, DVa, Hanzo, McCree, Mei and even Junkrat. Someone who IS better than everyone else in the lobby IS gonna wreck.