Yep, where I live you can start on a dirt road (20psi) then you are in the rocks (15-18psi) then you are in the sand (10-15psi) then depending on the weight I am carrying for the giving trip those all change 1-3 psi. A pre set deflator is really a compromise and the arb deflates in the same time it take the 4 pack deflators anyways. That being said the ideal way to do it is have the auto deflators set for the most common and the arb takes care of everything else. Space in my jeep is a premium so I had to have the one to do it all and for me that was the ARB.That's what I like most about the ARB. Many times I'm not needing to air all the way down, but going down to 20-22psi to smooth out the ride on easy off road stuff is nice. Not being stuck at a certain PSI has it's advantages.
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