Work in retail without e-ink and a lot of the concerns people have here already happen with paper. We do full store paper price tag updates daily, also someone will go around with a scanner making sure prices are up to date with website and print new sheets if not.
Normal days will consist of 3-5 new batches of tickets with the full store update batch containing normally ~10-20 a4 sheets. This isn’t a huge store either I imagine most wallmarts would have more products.
The prices already update super frequently and e-inks don’t really change that. It basically just cuts out the printing and placing, the person running around with the scanner now updates prices.
I think for workers they are nice as they reduce the chance of paper cuts and the back and leg pain from changing the 100s of bottom shelf tags.
The benefit for stores is they likely don’t need to hire as many people, less training and possibly reduced material cost over time as the paper would probably add up.