[petree]

Sometimes the lack of diacritic can change the meaning of the name for the worse and either way, names are deeply personal things that people are attached to, so they might want to have it written correctly, regardless. I wouldn't want someone to mispell my name.

[Fischgericht]

Understood. But when it comes to bank transfers, isn't "I recognize this misspelled name. That must be me!" good enough?