If someone were to decide they wanted to start running races their first one wouldn't be a marathon. This would logically be a poor progression with negative consequences. However, take someone with very low tolerance of their hip, ankle, and foot muscles, then instantly place a wobbly device under them, and it's considered a great "balance" exercise. See the irony here? This is what happens when exercises are memorized and assumed to have a particular affect rather than thinking strategically through what's appropriate according to your current settings.