Interesting to see all the pro-100%-remote comments here. I worked for a company for about two years. One year in, they decided to go fully remote. The goal was to save money (the business was bootstrapped at the time) and to allow one of the founders to move to where his wife was attending graduate school. I don't feel like our productivity changed much. I enjoyed the flexibility but found myself feeling horribly lonely without the normal day to day interaction. So, they offered to get me a dedicated spot in a co-working space. That helped some, but not as much as being part of an in-person team.
So I ultimately left, although for other reasons. Now I work at a place with a generous WFH policy but a central office. I WFH maybe one or two days a week and this is way better.
I think it depends on the job itself sometimes as well. I work on a data science team, and I've never found a good replacement for doing math on the whiteboard with someone. The communication barrier introduced with a network connection is just painful in that case.
However, I also live in Boston, one of the few American cities with (mostly) functional public transit. My commute is a 10 minute train ride where I can read email/slack and think about what I'm doing that day. Or if the weather is nice, it's a 30-45 minute walk. It's no pain at all to make it into the office.