Why is toe walking bad? The fastest humans and animals do it.

Facts aren't data, but as a counter to the narrative in this article: in my own experience strong calf muscles likely related to autism have allowed me to place at running events as someone with <2 years competitive running experience, and my mother to be the national champion at her age range for a decade.

Nothing bad about it - as a fellow runner though I would say it is definitely more adapted for short distance speed work.

Long distance though of course would still benefit from stronger calves. However toe walking also might make you tend toward tighter calves and posterior chain (which would leady to injury - especially when doing distance)

Sounds uncomfortable. putting so much weight on toes.