Edit: if you’re going to downvote me that’s fine, but please explain why “number of hours spent at computer” is at all a useful metric. It’s a genuine question; I’m not being facetious. I’ll get nothing done all day then wake up in the middle of the night with the solution to a problem. The amount of time I spend coding doesn’t really correlate with business value.
Some are arguing that people are just naturally more productive in office than at home. I don't necessarily but that argument but it at least makes sense. If what you're worried about is people slacking off at home then I don't quite see how RTO is a solution to that. I've worked with people in that past who showed up to the office every day and played poker online, browsed reddit and watched videos on YouTube.
If you are an employer and someone manages to stay employed under your leadership while having multiple jobs, that's on you.