Drive-thru lament

Just hit the Arby's drive-thru at lunch. Why don't they ever ask if you want the sauce? Horsey, Arby's original, I don't care. I just don't have the required 16 ounces of saliva in my mouth that it takes to burrow through a dry Arby's original. Now, shame on me, I forgot to ask for the sauce. but come on, the sauce question should be a standard tool in the drive-thru attendant's arsenal of order requisitions. Am I out of line here, or are fast-food establishments failing us, the customer, in this regard?