Then whomever tested it “to death” wasn’t particularly comprehensive. I speak from more than a little personal experience.
Of course it won’t help in every case, nor did I claim it would. That’s not the point, and your contrarianism doesn’t help anyone. Good day.
For reference, even Deban Stable has been at glibc 2.31 or newer for three major versions now, and another major version is on its way this year. I don’t think this will affect many people.