Amy Yin doesn’t foresee startups resuming a five-day-a-week in-office work schedule, even after COVID-19 has been battled back. It’s probably a safe bet. Many companies have learned this year that employees can be just as productive, working from home. More, employees — much as they might miss their own desks — no longer want to sit in a traditional office all the time. According a survey of 2,300 tech employees conducted this past summer, just 7% of respondents said they wanted to head into work every day. Yin experienced the…