Surely Mermaids is about supporting "trans" families, ie parents whose child is exhibiting a level of gender dysphoria. A trans CEO might not have the rapport that worried parents are looking for, and also send out the signal that transition is the way forward. Susie was able to advertise, rightly or wrongly, her own experience.
Just before the interim Cass report came out a paediatrician friend asked me whether I knew of any organisations other than Mermaids who supported parents/families. She had a family looking for support who had rejected Mermaids. However Mermaids were the only contact on the list supplied by her Trust. I suggested Bayswater, but warned her to be careful. She had already worked that out.
Who knows how Susie, who is pretty ordinary, got her charity into such a dominant position. I always saw her as a useful/dangerous fool who would be discarded when her usefulness ran out. (I credit Cass for the sea change.) I really hope NHS Trusts start using their own critical judgement rather than sub-contract to overpaid EDI people. If Mermaids is to survive they need someone sensible who will be able to survive a level of scrutiny and achieve the trust of, worried and perhaps gullible, parents. I hope Mermaids, in its current form, does not survive. That said, parents need something, and I hope the NHS is about to find someone more neutral to signpost to.