In the olden days when I did TKD, there was a lot of emphasis on getting a variety of higher and jumping kicks. I liked doing them for conditioning. I never thought they were practical for any real fighting. I think they found their way into the repertoire because younger students, say in the 8-20 age range, will find them anyway and want to do them just because they are there. They are fun and take a lot of energy.
Now I seldom kick higher than the ribs. I use them also for the surprise value. People expect me to kick to the legs, and I do that often. I hand strike to the head, for me, is just faster and far more accurate, and in the practice setting, safer. God help the person I actually land a head kick to.
The older I get, the better I was!