That's fair to be annoyed about. I can understand their approach and their tradeoff for a bit of better water-/rain protection and having less components inside. With an USB-C adapter I am using my analog ear buds, even though I switch more and more to bluetooth as I find them more comfortable.
Mediocre headphones, I would not say. They are definitely not top of the line technology wise, but I find them sufficient and sometimes even more than I expected fairly produced hardware to be.