I'm hybrid too, and while I personally like it overall [1], it doesn't help with one of the main sticking points regarding remote work vs in-office: Needing to live within commuting distance of an office. It's expensive, it limits people with kids to certain school districts etc. — In some ways it's the worst of both worlds for some people.

[1] I however, really, really dislike going into the office only to have a bunch of zoom meetings anyway.

I will second this, at my previous role, we had one day a week in the office. Which, unsurprisingly meant that my team would hoof it to the office, and sit around in dead silence at our computers, or sit through zoom meetings with the rest of the teams who were either in different offices or had a "permanent remote status" as management...

As you can imagine, being forced into an hour+ commute to sit in a zoom call with management who weren't even there was the opposite of motivating

That sounds great. I think I’d love something like that if, during in-office week, it was more than just half my immediate team that showed up.

I think one reason this isn’t more popular is that it’s harder for parents to plan around. Most of the parents I work with want the same in-office schedule every week - easier to plan around other weekly things like daycare and after school activities that way.