I've worked from home more or less permanently for about 4 years, it's very lonely. Plus, in the winter I feel like I'm getting hypothermia and in the summer I'm suffocating due to the heat. So I mainly work from the pub
Sorry to resurrect an old quote, but it's definitely a common pattern I've seen in the more successful perma-home workers I know. In practice not being near a company office doesn't make setting up a desk in the bedroom any more pleasant, so all the work happens in coffee shops, or increasingly in hot-desking or co-working spaces. Needless to say, the complete loss of access to their regular workspace has impacted them just as much as the loss of a formal office has affected the office-based. Possibly more so since they weren't typically doing long commutes, and therefore don't see any of the benefits.
Personally I (previous to this) tried to go in at least 4 days a week, but often only for 4 or 5 hours at a time. My commute is a healthy walk which I'm currently suffering from the lack of, and 20-25 hours is a good enough number to have all the in-person contact I need (both socially and for over-hearing and staying in the loop). Added to that, it makes it a lot easier (for me) to slack off after 4 hours if I'm getting nothing done, and then power through for an 8 hour shift at home if the day is working out.
Of course, being the boss and not being part of a large corporate structure has helped me do that for the last 15 years. When I was attempting to get away with not being in before 10 and missing whole days at previous jobs I did tend to lean on being too damn useful to fire.
As long as it's seen as a way to get the most out of your workers and keep them happy I'm fine with 2 days homeworking. If it goes beyond that then you need the right temperament in the people doing it and you have to manage it well, which is frankly easier when it's the exception. Pushing office workers into full time home working as an alternative to paying for office space just sounds like a catastrophe.