Per the (extremely fascinating) video, it seems that phonetic spelling from the dictionary doesn't always capture the correct pronunciation, or mechanically what is happening with the mouth... E.g. US "blue" with the 'w' at the end where we release the lips when done with the o. Hm.

I hadn't really thought much about how, mechanically, one has to reposition one's tongue, jaw, and lips to shift between the end and beginning of words and that can lead to a glide(?) or modulation if we speak without stopping airflow between words.

I suppose we should think of pronunciation in terms of motor planning for tongue, jaw, lips, etc. to be more accurately descriptive.