I stumbled on the height adjustment for the driver seat accidentally myself and was delighted. I like the extra inch of height for comfort and visibility. I assumed my base LX wouldn't have it, and had never heard of a manual seat height adjustment before - I always thought that feature was limited to electrically controlled seats, if then.
The downside to height adjustment is that the armrests are not attached to the seat. Fit has apparently have been designed for typical Koreans and not Westerners. Both left and right armrests are too low even with the seat all the way down for this normal sized American 5' 10". No overhead handle to rest my left arm on the drivers side of my LX either.
2018 Kia LX HEV Metal Stream with Advanced Tech