The thing is, I don't think any organisation is doing 100% homeworking (that I know). It's all so called 'blended'. I do two or three days in and the rest at home. It's about right. For me anyway. I'm a bit of an introvert in terms of how I work, so missing the usual office bullshine really helps me. I guess for those who love meetings, talking everything (and I mean everything) through etc It's less great.
Back on point, Johnson, Mogg etc aren't doing this for anything else than their own interests feel. Be it whipping up popular needle fights or, in Mogg's case (so it is rumoured), have investments in rented office space lol.