I can't agree with you there. Not about the music being good, but using original themes in place of custom ones. Even though I haven't played Chrono Cross, I have been rather pleased with the latest music choices in Rube Destiny, and I really like to see when hackers add (or even compose) new music because it not only gives the player the motivation to play with their volume on, but it gives something of an edge to the hack in terms of uniqueness.
I mean, there are boatloads of hacks that use the default music, and thus, the average hack forum player will have to listen to themes they already spend a lot of time with over and over and over again. Back when I was big time into hacks, I actually got sick of Fire Red music because of it, especially being a hacker myself. So seeing hacks with new music is a nice breath of air that makes it feel less like one is playing the original game and more like they are exploring a new creation entirely.