Rote memorization of a guide or following a "script" is not the same as qualifying for a position.

A sufficiently experienced and knowledgeable person will be doing things similar to what's in the guide because they've learned to do so through experience, not because they read it in a silly guide.

People seeking out the guides are typically the same ones who don't have the experience to back up what the guide tells them to do.

I'd guess very few people use every one of these things on a day-to-day basis and in my experience the bigger companies actually encourage you to brush up on algorithms before interviews with links to resources you can use. If you're really hopeless it's not like two weeks of study are going to teach you everything you need to know.