Practice and repetition are invaluable for ANY physical skill. Anything that helps you train proper repetition is a good thing.
Kudos on practicing and training. I know folks who've carried for years, but don't even train drawing from concealment. Heck, they don't even train their presentation (you don't even need to squeeze a trigger to do that. Just 15-30 minutes a day, to practice pushing out to develop that muscle memory for good alignment 100-300 times).
There's a reason that a LOT of the top competition shooters still practice dryfire on top of shooting thousands of live rounds every month.
For non-sponsored shooters like the rest of us, it's even more beneficial, as it's FAR cheaper to be able to train thousands of shots with airsoft, laser trainers, DryFireMags or simply an unloaded firearm, than having to spend $0.xx per shot.
That video of the Japanese kid illustrates that the biggest factor for live fire training is recoil mitigation. Most other things can be trained without live fire.