Earlier quoted context omitted.
If you are a native English speaker, these renditions will sound too close together for you, because the person pronouncing them is not a native English speaker. IPA is a coarse guide to phonemes; it does not capture, for example, the difference between the English and Spanish t , which is so great that I am still struggling to do it correctly. But they are both “t” in IPA.
> it does not capture, for example, the difference between the English and Spanish t Ah yeah, that's true. This is because most Spanish speakers pronounce /t/ as denti-alveolar (the tip of the tongue touches the back of the teeth) while most English speakers pronounce /t/ as purely alveolar (the tip of the tongue stops at the back of the alveolar ridge). I'm not sure why the IPA chart doesn't differentiate these spec…
I think this is a pretty spot-on observation. IPA does offer a bunch of diacritics for making more narrow transcriptions. For instance, Spanish's dental is [t̪].
However, the narrower the transcription, the less applicable it is to a language in general. Things like dialectal and even individual differences start to come into play. So in general transcription will only be as narrow as necessary to achieve some point.