Just think about how many unique professions are required before your daily job even starts to make sense. Someone is being paid to monitor a tank of fluorine compound so that it can be used to etch silicon wafers.
I don't think specialization by humans is bad, but I agree that specialization can go too far sometimes. If the person being paid to monitor a tank of fluorine loses the ability to do their own laundry or hold a conversation because they are spending so much of their time developing fluorine tank monitoring skills it's kind of a waste. Part of the human experience is learning and doing lots of different things. Even if our economy rewards hyper-specialization that doesn't mean that a person's entire life has to be focused on their hyper-specialized job.
Also, humans are the only species that can run a marathon, swim a lake, and climb a tree. We are generalists.