I trained on the original Intercom Plus, no scanners, no script checks, no e-pharmacy. Looked like SIMS (the inventory system) or a boosted PDX. My 400 script store had no dispensing machinery, everything was tray counted. No photograph with meds, so you had to send the bottle down with every prescription. I also did not have the benefit of trained techs (Walgreens routinely stuck a cashier as my "tech" when they even bothered), and when I did, I routinely lost them to higher paying gigs. Robberies were more common and store security/loss prevention was only at the region level and not the district. The original store I worked for priced in 10% shrink and a robbery a year into their profit/loss statements.
I still balance a phone a specific way and move my arms in particular patterns due to working for Walgreens. In my most stressful periods in my current job, I will answer phones with "Thank you for calling Walgreens, I'm ____ the Pharmacist" (my surname is alliterative with Pharmacist).
And while we can play the "who had the worst store conditions" and I'd certainly lose (the worst store in my area was arguably 3rd and Hell or Dogsh*t and Mormon where the cops were routinely called in for fakes, the PIC hung herself from the light fixture two months after being robbed and then some, and the place was robbed four times in 18 months), much of the technology has made it less error-prone for the volume than in the earlier eras. You don't get enough people, but you actually are more likely to get trained people rather than just whoever Walgreens stuck back there.