Anecdotally, but having done 100% WFH for over a year now, I think the first point depends a lot on company culture. We're given explicit permission to use work hours to play games/hang out together, specifically because of the lack of traditional social structures. In the same vein, we're given regular time to work on work-related projects of our choosing.
It definitely doesn't work for some people, but a lot of problems I've seen people bring up can be rectified by the employer. Some of them can't be, but those that can shouldn't be expressed as fact.
Yu miss all the fun with coworkers, all the fun side projects, productive or not...
..on the other hand, working from home, especially when they promote "whenever you feel like it", means you're "on call" all the time. Having "core hours" (eg 10-15h, weekdays) and having everybody available then (for calls, meetings, skypes,...) is ok, but I imagine this will mean ealy morning and late night calls and tasks, and workers will never be able to fully separate work and free time.