Guess coworking spaces are just expensive cafes where you pay to hear someone's startup pitch lol. Nothing beats that library silence for actually getting stuff done.
What about the people you meet who can actually help you work? In my experience, a good coworking space has more than just startup talk. I once fixed a coding problem in five minutes because a developer was sitting right there. Libraries are quiet, but that silence can also mean you're stuck on your own. The energy in a shared space can push you to get more done. Your mileage may vary, but for some tasks, a little background buzz beats total quiet.