Unlike other yukkuri with functional and useful braids, wasa reimu's braids are very short and highly lacked of "fingers", therefore they cannot properly interact with objects, let alone holding them. Due to having such terrible appendages, wasa reimu will find it difficult to work for the "yucieties" and will greatly depend on other yukkuri.
You may ask "But how about Myon, Chen, and other braidless yukkuri?". Well, those yukkuri types are born with no braids at all, so they will have to find ways to work around. Wasa yukkuri are born with such huge braids but cannot use them much, therefore, a defect.
Pugs and Scottish folds should have naturally died off because of how defective their body are, but because "Mr. Human" want their cuteness, so they inevitably live on and suffer more. In some stories, wasa yukkuri are highly priced, so they are bred at all cost, even at the death of dozens of unwanted koyukkuri to get one wasa.
So, what do you think?