Given that limitation, I'd agree. I could certainly practice Tai Chi forms/movement for physical health without needing to learn the Tai Chi MA. This is what I was talking about in my distinction of whether they're learning the MA, or just movements from it.I don't believe anybody want to take an online Taiji class to be a fighter.
If one only trains Taiji for "health",
- whether his hand can coordinate with his foot or not won't matter that much.
- whether he can understand the power generation method or not also won't matter either.