The genius of ancient martial arts systems cannot be denied. They are tried are tested. They have endured.
Whether or not they are viable in modern times is down to the school, the teacher and the syllabus - rather than just the art itself.
A pragmatic self defence syllabus must take into account the century we are living in.
Tai chi was codified into a self defence system thousands of years ago.
People fought in muddy fields and wore body armour. Low stances were necessary for stability.