Steve, that’s a really great example with yoga and stretching. The same could be said for martial arts and kicking/punching, story telling and words/characters, and even exercise and running/lifting/health (the health aspects are great, but it’s really the inner strength that we discover through being able to command and shape our body that benefits us in the long-run).
I don’t think there’s anything wrong with the shallower interpretation of minimalism, as I think a reduction of material possessions helps lead us towards a deeper understanding of ourselves. However, like you said, at its core minimalism is a philosophy that requires us to reflect on the broader implications that minimalism has on our life. It’s about questioning the importance and purpose of life itself.