Best use of a daily practice routine [Bob project]

[Bob]

So, is the best way to practice to create a daily routine made up of parts of real piano literature?  You have a piece that covers finger-work, a piece that covers 8ves, etc.

You create variations on each piece of real music to make them more technically useful.

Then, when you replace pieces periodically -- one type of technique work piece with another piece that uses the same technique.

Any comments?