This.

E-learning can be like Steam to some people. You buy the course and then it sits there. You get a dopamine hit when you buy, and you can finish the course later. Sometime.

Some people need structure. But mostly structure is a way of dragging along those who aren't soaking up learning already, who aren't naturally seeking the next problem and breaking it apart. Not everyone does this, and so structure helps as a forcing function.

There are some subjects where you need academic and theoretical grounding. Or expensive equipment. For everything else, it's best to get hands on and just throw yourself at the subject. There's nothing really stopping a motivated person.