People are usually eager to recommend things that they feel really improved their life. If you, for example, read HN, you see "sales pitches" (in the broad sense) all the time.
Yes, that's true. But it's both naive, arrogant, and rude to require those "sales pitches" to be good. At the end of the day, it's up to you to decide what's better for you. If you try to outsource it, you'll discover that the best sales pitches around are for dead-end technologies.
At the other side of it, people giving you those recommendations really have no better way to explain it. PG has an well known essay about language power, but even that isn't very precise. Some kinds of knowledge you really have to know before you understand what they are good for.
