Oh yeah totally! That’s a much better explanation of that specific phoneme. I went for the over-simplified version that was being taught to me in middle school, where I think the assumption was mostly “we need to teach them grammatical and structural rules and not worry about natural sounding pronunciation” which probably contributes strongly to the gringo accent where vowels aren’t pronounced consistently, but shift more like they do in English, and creates mispronunciations that are so grating and confusing (especially between certain a, i, & e sounds)