I believe that the perfect number of lenses for most situations is three. This allows you to choose a normal focal length that pleases you, a wide focal length for when you want that sort of depth perspective, and a longer lens for when you want a squished depth perspective.
More lenses only let you 1.) fine tune these basic decisions or 2.) allow you to achieve a specific composition when your choice of vantage points is limited.
In observing students with a great variety of lenses to choose from (since they didn't have to purchase them all), I have noticed that people are often too afraid to use a "wide" lens and instead choose a slight;y wide lens and the effect they wanted to achieve by using a wide lens in the first place is negated. Same for long lenses. The three-lens kit forces you to make decisions and not chicken out from them. Once you get used to only having three lenses, then you can start to acquire more as you see fit. I think this teaches you to pick your focal length more carefully than if you have nearly unlimited choices from the beginning.
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