Graphic Design Dilemma - Are Logo Changes Always Necessary?

These days, it seems like every man and his dog is contacting a graphic design company and asking for a brand new logo. When you take into account that some of these logos are less than 20 or even 10 years old, it kind of makes you wonder what has caused this rush in design changes. Whilst some logos are quite awful and need to be changed, others have seemingly nothing wrong with them.

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