I did not think that I was being obtuse, but will elaborate.
Kata is a bible for some. For others they are useless and discarded. And, for some, they are worthwhile when identified appropriately as worthwhile.
The trick is to have the experience and judgement to properly gage a kata's value. Part of that comes from trying to get into the mind of the form's creator.
That trick can be assisted by having an understanding of the form's history.
Which is why history can be revealing for some.
Students of poetry use this type of study aid (when available) to better understand and analyze a poet's creative process.
Its a great tool when the historical information is available.
Jim |