Fine, if you want to play CDs, buy a CD player for a car.
I recognized the obsolescence of a built-in CD-player when I got my first car with USB drive support, a 2009 Honda Fit. Since 2009 USB flash drives have increased in capacity while decreasing in cost and size.
I had always ripped CDs to iTunes, so all I had to do was copy them to a flash drive. Then, while driving a rental car in 2013, I realized that some cars (GM, in this case) would not play Apple's M4A files, so I converted them to MP3, for use in any car. Since I have always ripped CDs, no extra work was involved. Years ago, I also ripped about 20 LPs to MP3.
That was tedious, as I had to go through each LP to edit out pops and scratches.
You chose not to, so you're stuck with playing CDs. That's not Kia's (or any other manufacturer's) fault.