Having been the skater, coach, choreographer and costumier at various points in my (somewhat varied) career

I can tell you that many, many competitive skaters and coaches have a very limited musical library from which to choose program music. This is because they have spent most of their lives at the rink, listening to what other people are skating to rather than being out in the wild, exposed to all manner of musical experiences. These days, a skater's life is so taken up with skating, off-ice, ballet, gym work, etc that they often have little time for much else. I had parents who were utterly obsessed with music and actually wanted me to be a concert pianist (or flautist) rather than a skater and although this was very unhelpful from a skating point of view, it gave me a seriously wide musical education and therefore a great catalog from which to pick music to skate to. The younger skaters are pretty much bound by what their coaches pick and some coaches can be ultra-conservative and run everything past "the judges"...
There is also little issue of "musicality", which is the elephant in the room when it comes to skaters. Some of them have all the musicality of a brick. Which makes choreographing anything for them really, really difficult. Most fans and judges want to see some element of interpretation and with a skater who is pretty much blind to rhythm that is a really tough call. The reason tango is so often used is because it's one of the easiest things to work with when you have a skater with no musicality, ie a red and black costume (sigh), a stamp of the foot and some spiky arm movements, and you're good to go. And for me, that is better than a stirring piece of music which is almost completely ignored as the skater crossovers around the rink building up speed for jumps with no regard to the music at all. As familiarity with a piece of music helps a skater actually put their elements, etc, in the right place and end at the right point, sometimes a warhorse is pretty much the only way to achieve that.
Personally, I like to be surprised with something new but it's not always possible.