The biggest one for is, as mentioned in the article: casuasl collaboration. I mis being able to just walk over to a coworker. I’m just home every other week, which strikes a reasonable balance for me.
Calling it "casual collaboration" is not honest, as that's not collaboration. The other person is not collaborating, just being interrupted to help you with something. the only thing I agree is that you lost the casual talks in the coffee break or kitchen, but that is not always about being more productive.
We solve this by having a special office, placed in a "remote" corner of the building. It's equipped with proper desks, monitors, chair and so on. You can go there if you need a few hours, or days, of dedicated time. If you're working on a specific project, we'll often move the team working on that project to a dedicate office. For your daily job, you just just stay at your normal desk in a semi-open office space, with plenty of meeting room and smaller rooms for calls or online meetings.
The mentorship programs don't really work in my experience without actually being able to talk to them.