Grind range is grind range regardless which grinder you use. I think that you are making more of this than there really is. For any grinder there will be a range of acceptable grind for any given type of brewing method. The same can be said for changes in humidity, blend, roast, or age of the coffee. if anything, there is the added benefit of using a stepless grinder in that smaller adjustments can be made. With Rocky, one click can make a 3 or 4 second difference in an extraction, all other factors being equal.
I went from Rocky to a Mazzer Kony, and the quality of the grind from my Mazzer is astonishingly better than Rock. The build quality and design of the Mazzer is also that much better. I use the same grind for my Aeropress as I use with espresso. Don't want to have to make wide changes for different methods of brewing? I keep a small grinder as a spare for drip and such. I also keep a large one handy... you just never know:

But there is more to a grinder than just a choice of stepless or stepped. The pro or shop quality grinders usually have higher quality burrs that last longer, they hold their adjustment better, their adjustments are more precise, the burrs are held is more precise alignment, etc.
Look at all your options and decide which is best.