How did the Shure SM58 become the industry standard mic for live vocals and is it still relevant?

In 1965 when the SM58 was introduced, the live audio industry was still very young and uncomplicated. One of the things I’ve always disliked about the SM58 is it’s advertised “frequency response tailored for vocals , with brightened midrange and bass rolloff”

Shure SM58 features

Shure SM58 frequency and polar response

Extra 2k to 4k might of been helpful if using the mic with a PA that didn’t have any HF drivers. For example, the Shure Vocal Master PA introduced in 1967. No high frequency drivers at all.

Shure SM58 spec sheet PDF

Shure SM58 – owners manual