On points raised:
My DD was 13/14 when she got her first debit card & current account. Some of our relatives live a fair distance away from us and increasingly didn't want to sent cash by post for birthdays etc, and paying in cheques meant a trip to the bank which was a decent bus ride away, so we decided to make it all easier for everyone. Now her family & friends just use Internet banking to send her money. If she owes a friend money she can send it using their mobile number.
Her dad and I also set up standing orders so she gets a small allowance every month, which she has to manage herself. She uses an app on her mobile phone.
I know not everyone has a smartphone nor access to the Internet. But the majority of people do.
There is a cafe in a large park near me that only takes card payments and I have to say the queue is kept down by the fact you just swipe and go. London buses are cashless, and the Tube will be the same way within five years. I work for TfL and will get grief for when the Tube is card only, but I recognise that it will save TfL millions in the long run. (They can cut staff and save on security custodians for a start).
It's not poor parenting to have not got your child a card at the age of six 🙄. Those comments are very judgemental and unkind. But the world is heading in a cashless direction. I think parents need to be clued up on this.
As for the whole "tracking" thing we lost that battle in the early 2000s. I hate the emailed receipts thing too. You end up with loads of marketing emails which means time spent unsubscribing from mailing lists. I still ask for a paper receipt or of the shop says they aren't available 🙄I say not to bother and walk away. (ProCook and Uniqlo being two examples)