Most langauges already have their own writing system that people are used to. It would be a major pain to switch. Some languages from the Coast Salish peoples of the Pacific Northwestern U.S. do use a modified form of the IPA (e.g. Luhshootseed). These languages didn’t have a written form prior to the popularization of the IPA, so the IPA was adopted (with some modifications) https://tulaliplushootseed.com/alphabet/
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