So I'm gonna try my best to translate some of the masterpieces here and mainly for discussion if we have a chance to talk in person.
I know the theory stuff is sometimes abstractive though absolutely useful once you understand them well, but I'll explain to you mostly by common sense so that we can communicate as normal.

According to some of the masterpieces, it's really unbelievable when you achieve a high-level tai chi ability. But only a few masters can do that and some is still a question for nowadays people.
But also it's a good news. That's why we need theory right? Theory has already show us something ahead and leave us to work on harder to make them come true. I have the faith on that.

Tai chi is a practical activity so it mostly relies on people's practice. No practice no theoy. I don't approve phraseman who talks a lot of theories but for himself, he even never practiced tai chi. Acturally, in all the tai chi threoies, you can always find some sentences imply the importance of practice and maybe you will understand some day that tai chi theory is like a ghost, and you never know if it exist unless you meet it.