[AmericanChopper]

Two main things.

1) Timezones

1) Working from home takes a rather significant toll on teamwork and collaboration. Allowing people flexibility with their working hours/location is a no-brainer imo. But unless the role is specifically suited to it, you probably want people to spend most of their working hours in the office.

You get the same issues when you need people in geographically separated offices to work together. Obviously lots of companies do that already, but you still have to account for the inefficiencies it causes.