It’s not a perk at all in 2018, IMO, except perhaps for some logistical issues you might personally have (eg dealing with your kids, etc). I speak from experience. If you are maintaining full-on focus, as you said, you’re only saving the company money. Every point you’ve made here is valid.

Working “remotely” actually puts the entire burden of managing an office and managing deadlines squarely on your shoulders.

EDIT: I mean managing your own deadlines of course