Earlier quoted context omitted.
Perhaps I didn't specify that perfectly. I wasn't saying English is poor in vowels, I'm saying that it is flexible in how you use them. Khmer has 22 specific vowel letters, each letter that indicates exactly how the sound is made, even the differences that of how the previous letter will effect the sound. English has 5, and no real consensus on how they are used, let alone the tone of voice that you need to use to in…
“Letters” are irrelevant. We are talking about the spoken language, not the writing system. American English has 15 or 16 vowels, and (not counting tone) the distinctions between them are just as meaningful as in Khmer or any other language. “Bit” and “beet”, or “but” and “boot” are different words, after all. Where are you seeing “flexibility” in the use of vowels? Again, we are not talking about “letters” or the wr…
My previous example of how to pronounce 'button' varies depending upon where you're from...but is still recognized by the most English speakers. Some folks pronounce it but-ton, others but'n.
Water can be pronounce in a variety of ways. Actually the list is endless...I'm surprised you're arguing the opposite. Compared to Spanish, or any number of languages where the vowels are very specific (disregarding the Castilian ascent), English is very forgiving. Bringing up Khmer's letters was to show that the vowel sounds have been formalized in that language, where English allows for much more variance.
Listen to any non-native English speaker, they can be all over the place and still understood.