I'm not the person you're responding to, but I think what he meant when he said that a "strict phonetic transcription" would be bad is phonetic vs. phonemic. Most writing systems (apart from things like Chinese) represent (some of) the phonemes of the language, not the phones (not phonetic). For example, in English we have two kinds of p-sounds: one is found in words like 'pill', the other in words like 'spill'. We write them both the same, because which sound the letter should take is determined by the environment: after an /s/, it's pronounced without a puff of air, elsewhere (or mostly elsewhere) it's pronounced followed by a puff of air. It's actually hard for most native speakers of English to tell the difference, although speakers of languages like Thai, where the two sounds can appear in the same environment and can be used to distinguish different words, can hear the difference just fine.

Bottom line: writing systems that are easy for native speakers to use, usually represent the phonemes of the language, not each phone.