[fiblye]

Many, many learners wish Japanese had more available phonemes. One of the biggest problems with Japanese is it imported batches of tens of thousands of Chinese words and forced them into a language with only a fraction of the sound complexity. The result is loads of words with the same pronunciation but completely different meaning. "Shoushin" can mean a work promotion or cowardice. "Shinkou" can mean attack, (military) invasion, progress, encouragement, pickles, or religious faith. None of these usages are rare.

If English had half the available consonants and vowels it had now, it'd be far more difficult to learn rather than easy. Japanese has the same problem.