I was reading some of the Ars comments, and some other benefits I imagine someone must be seeing (at my work) is we were completely out of space. We didn't have the budget to build more offices, we got another old building cheap and filled that in a couple months, we ran out of parking spaces during most times so people were trying to show up at 7:30AM to get parking. Since going hybrid / mostly WFH for a bunch of people, and onsite if your particular task that day requires it - we're still fighting over "real estate" that no one sits in (IDK, management fiefdoms I guess?) but some space was freed up, there's always parking for when you need to stop by for a hour (we went from 95% capacity most of the time and 100% full when busy to 66% capacity when busy), and most everyone is more happy with the basically "free raise" from way less gas / commute costs.
For the Dell / other company thing - there's this persistent management belief (that I think is more delusion) that people in the office are working because they're in the office. And managing / setting metrics by physical presence means that's what you get from people. People work to the metric, it's why it's so tricky to do KPIs etc. So you end up with people coming in at 7 and leaving at 6, but they're taking 2 hour lunches, hanging out at the water cooler or in a break room for a long time, shooting the *bleep* for hours with co-workers, watching youtube or playing on reddit or facebook etc. Because if you're "grading" on being there instead of what is getting done, people will have the most enjoyable "being there" they can - they're getting paid to be physically there, not get something accomplished.
OTOH - if you're doing "grading" on getting projects done, or customers served, or items shipped, or ad campaigns completed, or problems solved etc... that doesn't need you to be in a specific place for lots of it and works if they're in person or remote. Better for the company is you're tying pay to getting hopefully important stuff done rather than hours in a particular chair.