In your link thread, all I find are people who think Tracer is fine, and they listed her weaknesses while the one who said she’s hard to kill got downvotes.
There are many other similar thread, but pre-dive era is when Tracer is not a common topic - aka generally balance. At that time, people were too busy complaining about pharmercy.
I agree as soon as they watch the pro scene, they jumping on the bandwagon without even meeting any good Tracer themselves, or at least the one where they described as “unkillable 299 HP 1 v 6 monster”