It might be nice to have somebody wash the windows and check the washer fluid level, but it's hardly essential.
We don't even need them to run the credit cards any more. It's so weird going to a station in New Jersey, handing the attendant your card, and having them slide it right on the pump, just as you would. (And yeah, I've avoided filling up in New Jersey for the same reason: it takes longer.)
Maybe this served a goal at some point, but technology seems to have vaporized whatever it could have ever served.