I got out just before the change and am hearing some pretty dopey stuff from buddies still in the program. Like they can't go pee behind a tree any more, can't swim with shirts off. Trust me, dynamics change when girls are around. There was a mixed program already, btw, called Venturing.

I'll add that one of the best things about Boy Scouts was that we could do stuff that was dangerous, but not too dangerous. We didn't have any moms come along either, and I think that helped. Dads would stop us from doing something truly stupid (like permanent injury type stupid), but not something dumb that would bruise us and teach us a lesson. It also allowed us to do lots more fun stuff.

These days, tree forts are a no-no, apparently. Some guys from my old troop were building one at a mixed event recently. Some girls from another troop came over and said it wasn't safe, then got some karen from their troop to come yell at the boys. Oh, and and apparently it's no longer okay to climb above chest height these days, because it's "not safe". I'm way too young to be saying, "Back when I was young, we did $UNSAFE_THING all the time! We liked it, and never got hurt." Or at least, I thought I was.

I cannot relate to anything you've said and I spent I think 10 years in a mixed one

That's because males naturally use aggression/assertiveness to establish social hierarchy. That's the reason for having all-boys groups for youth, it gives them a space to work that out in a controlled way and learn how to channel their energy and aggression in positive directions.