hardcourt needs more variety. that's the only superior thing it has going for it, that it can be made with varying degrees of speed/bounce.
I love playing and watching Clay court tennis. If you haven't played on clay, find the nearest court and play a few sets. You'll be smiling from ear to ear by the end of it.
Disclaimer: I'm NOT a coach...
Real tennis: https://www.youtube.com/watch?v=yDqnkLJ9BtM