I absolutely agree that you have a good point if we're talking about hard mode! In hard mode finding letters is not only the goal of the game, but also something that hinders you in achieving that goal. So finding common letters later can clearly be an advantage then, especially if the strategy you're running is to set aside some number of guesses at the start for letter-hunting.
This is just by my gut feeling, but In English it feels finding vowels is less helpful for narrowing down what letters can go next to it than finding a consonant, and especially an uncommon consonant. The only languages I really know are Swedish, English, and JavaScript, but it feels like the irregular spelling of words in English vs their sounds mean that vowels can go anywhere they damn please given just one or two other fixed (green) letters around them. Whereas consonants following each other can do weird things on occasion, but if you have a word starting with T you know that if it's not a vowel coming up, it's pretty much for sure is going to be H, R or W. T's in the middle of a word add C and another T as other common possibilities. But for vowels, loan words with spellings from languages that treat vowels differently mean that such rules for are much fewer and much more frequently broken. Very often when I get stumped trying to figure out what word could possibly fit with just one unknown and four greens, the reason is that I overlooked the word is because I pronounced it wrong when I checked the possibilities. This is less of an issue (but can still happen) when I play word games in Swedish, and I don't think it's mainly because it's my first language; having had a spelling reform, even if it was in 1906, means that Swedish is a bit more regular in how it uses its vowels.