For me, this _does_ work and I have proven it many many times over the years by adding entire categories of technical knowledge to my repertoire. And not superficially, either - I get paid very well to do things professionally that I taught myself by reading Wikipedia.
If my experience were commonplace, the "it won't work" statement would be highly contentious in the comments here. Since it isn't, I guess I can deduce that I must be an outlier.