Without prejudicing the rest of your points, computers are very unlike most inventions. Computation is extremely powerful, our only working definition for what it is even is relies on an intuition, called the Church-Turing thesis, that essentially says the computers are doing categorically the same thing we are, but doesn't purport explain why that's so. It looks observably true and that's the best we have.
So, it's entirely unfair to suppose that since people got used to having tap water and so we are surprised if a person can't operate a tap, therefore they should be used to the entire complexity of computation by now.
You definitely _should not_ count machines that aren't actually computers ("digital accounting machines with storage") since those aren't Church-Turing, they're just another trivial machine like a calculator. Instead, compare the other working example we have of full-blown Church-Turing: Humans. Why aren't people somehow used to everything about people yet? People have been around a long time too. Why isn't everyone prepared for every idiosyncratic or even nonsensical behaviour from other people, they've surely had long enough right?
So, it's entirely unfair to suppose that since people got used to having tap water and so we are surprised if a person can't operate a tap, therefore they should be used to the entire complexity of computation by now.
You definitely _should not_ count machines that aren't actually computers ("digital accounting machines with storage") since those aren't Church-Turing, they're just another trivial machine like a calculator. Instead, compare the other working example we have of full-blown Church-Turing: Humans. Why aren't people somehow used to everything about people yet? People have been around a long time too. Why isn't everyone prepared for every idiosyncratic or even nonsensical behaviour from other people, they've surely had long enough right?