I used to do that too. My friend still does. The only problem is that I am so much a perfectionist that it would take me twice as long to get the nap all the same direction, not to mention still having some tooling marks left over. I guess you could call me a.d.d. when it comes to cleaning, it has to be perfect. As for the "fluffy" part, I have not seen the benefit of grooming with the wand. Not saying you are wrong, just haven't seen anything better than raking or grooming the nap. The rake separates and re-aligns the fibers, which also increases dry times.
When I leave the house it looks like the carpet was just installed, with not a single footprint or mark on it.
In the end, if the client is happy then so is your wallet. It all comes down to results versus expectations. I usually go far beyond the expectations of my clients, which is not always a good thing!