I wasn't referring to playing what already comes easily. I was talking about making whatever you do as musical as possible. If you always practice stuff that is simply technically difficult, you never find your sound. You get more and more technique but never learn to make it "feel" good. (I know a lot of guys in their 40's who still practice that way -- and it shows).
It's also not about chops at a certain point. It isn't like the more you practice the more and more chops you get in a never-ending linear way. We all have a cut -off point. Then, it's a matter of taking whatever technique you have and saying something artistic. THAT, takes a lifetime.
My assumption is that the OP was seeking a general view and didn't know WHAT to practice-a common problem.
If you are working on what is difficult and trying to play it well I would assume that playing it well would mean playing it musically.
As to developing "feel" and musicality I'm not sure that's something for the practice room, but something for the rehearsal hall, the stage and the studio. If my experience is a common one feel comes with those years of gigging and learning. You can speed learn it to an extent by recording yourself and your gigs or practice sessions, finding a drummer you like and playing as much as possible with them, or even playing with a drum machine. I have taught students for 33 years at one college or another or privately, and I've never seen any other way to develop "feel" than to listen and play along with recordings you like, trying to emulate the sound, touch and timing of those players and then figure out what you like from them and try and come up with your own spin on it while playing in as many musical situations as possible.
I look at chops with this analogy: If I'm driving from Nashville to Memphis and I have to pass a semi I can have a choice of 2 cars. Both will pass the truck. One is a Kia and one is a Porsche Boxter. I'm going to opt for the Boxter since it will likely hit 85 in second gear-the Kia, not so much....I don't know that you can continue to develop your technique in a linear fashion but it's sure fun to try.

Practicing is NOT playing YYZ, Donna Lee or Classical Thump over and over because you can, IMO. There's a certain bit of maintenance practicing you have to do to keep that music sharp if it's important to you, but each of those pieces will have a certain set of musical and technical fine points and there are an infinite set of those for an infinite variety of music. It's a moving target, for sure.
Living in Nashville as I do, feel always trumps chops. If you can't make half notes groove as hard as your 16th note extravaganzas you will starve....