It's not "elitist", it's principled. The only question that matters is if a business practice is violating fair market principles and relevant laws or not. "What about my grandma" is not an argument and not relevant to the judges' judgement. The world doesn't revolve around OP's grandma.

Furthermore, the most potent attack vector was, is and will always be social engineering, which is much more likely on smartphones than on dumb phones. So if it's not concern trolling, then the obvious move is to buy a dumb phone for grandma instead of depriving everybody else of their freedoms and rights.