No need to apologize. It is good to ask questions.
Mantak Chia is an accomplished master. I have a few of his books for reference. My favorite is the fusion of the five elements.I find most of his methods way too complicated in comparison. He is specifically Taoist in method. I love Taoist..but, there are other valuable qigong sources to utilize.
His body of work is not connected in the sense of it being a cohesive path to follow.
Micro cosmic orbit is important. Again, there are many shades of gray regarding peoples individual needs regarding practice, growth, and concrete results. Active exercise shouldn't be discounted. Especially for beginning qigong practioners. That blanket statement doesn't take in account better results from other things at different levels. I do think you can maintain physical health with the orbit exercise, but I see that happening at a higher level of practice. Even at that, there are other aspects of qigong to involve oneself in and experience. The healing aspects of SFQ, and the ability to heal others is more unique to SFQ. Healing work can go beyond one's own health.