As far as I am concerned the Office is dead, open or not in the tech field. I mean an office which you travel to, and work all day. No way am I going back to that for less than another 70k a year on top. It isn't 1930.
I'd think many companies would disagree with you. Slack and Skype still cannot replace face2face meetings so that working remotely (full time) is a non-starter for many jobs.
Let them disagree, I won't be working there anyway so it isn't a concern.