Why do IB deals usually have so many banks staffed on them?

Sorry for the potentially dumb question here, but I'm just starting to learn more about IB and don't understand this. On any big IPO, it seems like every single BB and a few boutiques are advising on the deal, and even on smaller deals you will usually see one or two BBs and a handful of boutiques.

Why is it necessary to have so many banks working on these deals? Isn't it a total waste of the company's money to pay for fees to all these banks? Are the banks doing redundant work (ie are they all building the same models) or are the responsibilities split up? Do the competing banks work together when they are on the same deal?

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