@SusanPotter @griff Ahh, FFS.
That is so much bullshit for you.
Water cooler moments do happen, and, for some people in some job roles, really important.
I worked remotely for more than a decade and flew 1,000 miles every two or three weeks for two or three days at my choice (with my management's total support) so that I could get them - but I was in a very different role to yours.
There were threads that I pulled together on those trips that avoided bad hires, bad contracts being signed, or switched directions that saved projects running over time and budget.
Not every time, but often enough, that like a gambling win, it made the grind of travel seem worth it.
Someone I employed in 2004 who was fully remote since 2006 (at a similar distance to you, in a more similar technology role) has been told they need to be in the office two days a week (and that, realistically means overnight accommodation at their own expense).
Corporate management are idiots.
Best wishes.