I will never, and I repeat, never, return to working in an office. My quality of life since going fully remote is through the roof, and my employer is every bit as happy with my work now as they ever were.
Is that the same for cofounders of companies though (because that's what YC is for, not for employees necessarily)? Seems like being in the same hacker house or area is quite useful to them in a way which wouldn't be for regular employees. I'd work remotely as an employee too but I'd much rather work in person with my cofounders.