Dude, your whole argument is one big appeal to authority. WTF do you know? Why should anyone listen to you or the so called experts?
I know first hand that what you are saying is totally bunk. I don't have to go on pubmed and look up articles to support my opinion. I have experienced "internal strength" with my own senses. There's a scientific explanation there, no doubt, but you don't have it and neither do the so called physiology experts.
Why should I listen to you over my Taiji teacher who has massive internal skill and can readily demonstrate and who has never lifted a weight in his life?
Think about Taiji for a second, the whole principle is not to use raw force against force...what is weight lifting? Using raw force against the force of gravity to make your muscles hypertrophy. Taiji can be extremely hard or extremely soft but you have to learn to relax first and not fight force with muscle, it has to be a whole body affair...you become hard through extreme softness. Its a totally different way of moving.
IMO you are doing a huge disservice to beginners by stating that weight training is an acceptable adjunct to IMA training. Until you can separate "internal strength" from "external strength" then it is going to cause a lot of confusion.
It is obvious to me that you have zero understanding of internal principles.
Stick with your weights and external MAs and you'll do fine but don't confused the two.