Yes I agree that the HT system is made up of bits from here and their, I also agree with you on the important parts. However, I do a lot of my training for martial arts and general health so the iron shirt system, standing, tendon changing, ectra are of interest to me. I have studied other iron shirt systems as well it was them that got me in to alchemy.
About the later stuff I was their in dao garden when people were arguing with him about stealing stuff they were teaching so I think the new stuff is all their to meet a demand. (but healing tao is their to make money).
On seaman retention you are right it has to be the way, when I do ejaculate I feel like shit now and the great sexual feeling I associate with my pre daoist times just aint their. I feel weaker and as you have pointed out most, not all but most systems require it.
So hopefully we can agree that seaman retention and alchemy are the important parts and every thing else is optional.
IanB