I think the consensus is that single-sex schools don't work for everyone but in a broad sense (and somewhat counterintuitively to me) work better for a larger percentage of boys than the percentage of girls. Of course these are broad conclusions; those "success" percentages may be small (I haven't followed this work closely). Anecdoctally it was great for me while my sister considered it disastrous for herself.

Despite being happy with my single sex education, I'm really glad that scouting is finally been desegregated in the US as I noticed in scouting in Palo Alto that the boy scouts had much better opportunities than the Girl Scouts did. And I can be glad even though I did notice my son benefited from having a section of his life that was male-only. That will probably still be possible.