[retsibsi]

Location/accent is important, but sometimes we can get by without IPA. There will be some ambiguity, but often we're sufficiently familiar with each other's accents to interpret phonetic spellings as intended. (Though I do think the ə symbol is indispensable, because representing the schwa sound with 'uh' is just confusing.)

edit: sorry, just realised I probably misread you (as saying we should say where we're from and use IPA), in which case this comment is redundant.