It's called the Internet. The problem is that people generally don't know what to search for, if they even know they should be learning more about some facet of modern life.
Why? How can there be such a thing? What is there that prevents someone from recording what they encountered and learned, and passing that knowledge on to others?
I don't think anyone's disagreeing with you regarding the need for practice. Reading, Discussion, and Practice are all part of a balanced education, on any topic. I'm objecting to the notion that there are topics for which the written word is useless.
The practice isn't about acquiring information, so much as it's about moving that information to a different internal subsystem.
At the root of this, you think all knowledge can be encoded in words and shared, and that's the problem, it isn't true. Many things cannot be shared via words, only experienced.
Having things explicitly called out is way more efficient than trying to derive everything yourself (see also, effectiveness of supervised vs unsupervised learning).
They do of course practice in real life, turning theory into practice. That's an essential stage which comes after learning theory on the internet.