Walter:Except for those I've made bold in the quote, they are all required by YMCA. There's no requirement for a no mask ascent, and no requirement to conduct many skills midwater. I agree that's a shortcoming of the standards.
I think those skills that you identify as being required by the YMCA are very important. In my opinion that puts the YMCA more than a little bit ahead of those agencies don't require those things.
In some other courses, the amount of time that a student is actually required to be midwater during the whole course is only a couple of minutes and they aren't ever required to be there during a dive and trim isn't even mentioned.
Lets face it, if a set of standards require that the student spend a significant amount of time midwater and in control/trim, they are used to being there and there is a LOT better chance that the student could perform additional skills midwater. I wouldn't necessarily leave it to chance but you're at least part way there.