Sleep - skill affected by development and practice

The most common misconception about children's sleep is that they will learn it on their own. This couldn't be more wrong. Let's break it down.
Sleep is a skill like rolling over, walking, or talking. It is something that has to be practiced to be mastered. Like many skills, it is made up of both a developmental and learned part.
The developmental part of the sleeping skill is responsible for stages of sleep, waking up a child to eat, amount of sleep they need in 24 hours, desire for a developmentally appropriate bedtime, circadian rhythm, and melatonin production.
The learned part of the skill is responsible for the ability to connect the sleep cycle, self-soothe at bedtime, naptime, and in the middle of the night, and associate sleep with something pleasant and good.
Kids won't be able to learn a certain part of the skill if it didn't develop yet. That said you can't force an infant to self soothe, stay asleep for longer than their body wants, or put them on a nap schedule. You can practice being comfortable in the crib, on a flat surface, offer an early bedtime when the desire for it develops, and educate yourself.
We can't expect infants to enjoy sleeping in their cribs or bassinets if they never practice it. We can't expect them to put themself to sleep if we rocked them and didn't create the opportunity to practice it.
When adults want to learn a new skill they do research, attend classes, webinars, join groups, and practice, practice, and practice. So why do we expect children to learn a new skill without practicing? Without creating a safe space for them to do so? Without dedicating time for it? Without educating ourselves what they can do developmentally?