The difference between multiple startups sharing an office and a coworking space is that in the former case there's no third party whose space they're in. It's

The difference between multiple startups sharing an office and a coworking space is that in the former case there's no third party whose space they're in. It's their space. I'm sure there are advantages to coworking spaces. I just think the disadvantages outweigh them, at least for YC-funded startups. They're already part of a community of startups, so they don't need to seek one in the place where they work.