To make sure the commercial real estate industry doesn’t fail

The companies won't allow having a mostly empty space that they are paying for. you on the other hand can have a mostly empty space (your home) that you are paying for while you work in the office. The companies' expenses are more important than yours.

3. Because the company gets some tax breaks from the county by having asses in seats.
4. Related to 1, your boss made poor real estate decisions pre-covid and wants to recoup that loss.
5. Most CEOs are older and don't want to understand the newer WFH dynamic.
6. Management does not trust the employees they hired.

My workplace did the opposite of mandatory RTO and reduced the space they're renting in half (from 2 floors of a business center to 1). It means we have to hotdesk whenever we do need to work in the office, but that's a small price to pay.