well because it’s kind of a forced adoption in an ideal world we would have developed a common tongue by slowly merging the languages, or at least would have taken one that’s pretty good and then improve on it. For example Hungarian is much better in the sense that what you write is what you pronounce, not the mess that is English, so in an ideal common tongue I feel like that aspect would be adopted.
Of course Hungarian also has stupid parts, ly (<- that’s supposed to be indeed one letter) and j is the same thing. x is just ks, y is pronounced the same as i and w is just v so there is some extra fat on it, but other than that the 44 letters cover all the sounds you make while pronouncing words.