Do you have any support for your position that that is a poor spelling? There are multiple ways in active use of transliterating Japanese. One of them involves

Do you have any support for your position that that is a poor spelling? There are multiple ways in active use of transliterating Japanese. One of them involves writing shi+i as shii to produce shiitake, which is then left as is. Another one of them involves writing shi+i as shī to produce shītake. As ī involves a marker English does not have, it gets dropped when used in English. Both make sense.