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With experience, you learn how to be able to spot the latest fads that will likely be waning or gone in a few years once they're no longer shiny things. This can make you very unpopular with those people who take it for granted that shiny things and new things are almost certainly better than non-shiny, non-new things.

Remember when MongoDB, for example, was widely assumed (by the inexperienced, mostly) to be the obvious data storage tech for building virtually any web-facing application? Now, after wide experience with formerly-shiny Mongo, it's viewed as just one among many alternatives for reaching "web scale".