I agree with you, but I think newer players should still practice this stuff just to gain better understanding of how the character works and better control over all, even if they won't use most of this stuff in real play.
with nana you can't WD too far in front of popo. It's kind of a shorter incremental motion.
really work on dash dance desyncs, wavelands, ledgedashing, and your basic dthrow->dair CGs and just comboing in general.
I recommend just sitting down for about 30 minutes a day and practicing fluid movement, making desyncs second nature, and practicing basic combos.
As you get more comfortable with the basics, start reading through some of the topics here, watching IC tech videos, etc. and just incorporate some of that stuff into your practice regiment.