Can you have too many screwdrivers? It's a philosophical question that we like to ponder about on occasion. There are different types anyway, each with their own function and value. A few are certainly worth mentioning.
The hand-held screwdriver is the ideal tool to loosen stuck screws and the delicate precision screwdriver usually offers a solution when the big tools can't. An insulated screwdriver is extremely useful if you're the sort of person who forgets to turn off the electricity before starting to tinker with things.
It is fair to say there are no superfluous screwdrivers. Each one deserves a place in your workshop or garage and will come in handy sooner or later.