Here's the fundamental problem: thinking that koryu are 'impractical' simply because the likelihood of being attacked by a sword-wielding enemy is fairly low.
Is koryu modern self-defence? Of course not, and I don't know anyone in koryu who say it is. But koryu is so much more than the mere techniques. That's the point; it's a system of transmission, it's a culture, if you will.
I find it stupendously practical, in that it is beneficial to me. The fact that you cannot grasp that, as your outside of the ryu, is not really my problem, but don't base your accusations of 'impracticality' on your lack of understanding. We're not even using the same ruler to measure.

Regards,

r e n