mbstring Detect Order Significance

Could anyone elaborate on the significance of encoding detection order? 
Specifically I'm wondering why the default detection order (auto) is
ASCII, JIS, UTF-8, EUC-JP, SJIS?  Wouldn't it make more sense to have a
default detection order along the lines of ASCII, SJIS, EUC-JP, JIS, UTF-8
which (I believe) would be more in line with the relative degree of use
for each encoding?

Are there any "gotchas" I should look for when setting the detection order
myself?

Thanks,
Evan


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