I think it's just a matter of people adapting to the tools that are easily available. Almost 100% of the time I've seen someone use an actual basic tabletop calculator, they've been tallying prices and slapping on a sales tax. At that point it's just a learned ritual and they're not thinking about order of operations. If they needed parentheses, they'd just memorize that the parentheses go around the prices.

Once the computations get complex enough that you have to write down the formulas, then it makes a lot of sense to treat the computations as algebraic expressions, meaning PEMDAS.