I wrote an article very similar to this a few months ago. I make a similar argument: we need defined workspaces, and when we're there we shouldn't do anything but work.
Loved your post! I especially identify with "not actually working from your home while you’re working from home." I too found that working from a coffee shop on my remote working days was way better than being in the basement at my house. The coffee shop was nice, because it still allowed me to work outside of the office (without the distractions of the office).
http://burakkanber.com/blog/staying-productive-while-working...