I’ve not read the whole thread, but:
Sandi has a history of getting involved at the start of movements which represent important societal issues. She was there at the start of the Women’s Equality Party; when same-sex marriage became legal she was part of an enormous celebration of same-sex marriage (including her own) at the Southbank Centre in London.
The relationship between the Church of England and England is is cemented. The two are intertwined in geography, history, theology, education, law, politics, the military, even healthcare and more. You can argue that this ought not be the case in 2023 but you can’t argue that it isn’t the case.
Sandi is an accessible figure and Welby to an extent a popularist, part of why he is taking the church in the direction he is in regards same-sex marriage. Their conversation and her short video make sense to me from both sides - hers as a media figure and the C of Es as well. As Sandi says, the direction of travel for the CofE is the right one but the timelines between the CoE and UK society are desperately out of sync. As I said to a friend when the announcement came from the Bishops a couple of weeks ago, it would appear “the C of E is desperate to alienate anyone under fifty…”
Welby is trying to hold onto the entire Anglican communion, no easy task when opinions are so divided. I do not think that he got it right on this occasion, but I would say that. I do think he is aware what he is doing.