If you are struggling with your mortgage on a particular month, you can’t do an odd job to get you through
Instantaneous bank transfer via online banking or a multitude of easily accessible apps
Your child can’t go & help the local farmer to earn a bit of summer cash
See above
No more cash slipped into the hands of a child as a good luck charm or from their grandparent when going on holidays
See above
No more money in birthday cards
See above, oh, and it's silly to send cash in the post given the frequency with which Royal Mail lose items.
No more piggy banks for your child to collect pocket money & to learn about the value of earning
They can easily do this with a bank account and transfers
No more cash for a rainy day fund or for that something special you have been putting £20 a week away for
Again, height of ease to do this with a bank account
No more selling bits & pieces from your home that you no longer want/need for a bit of cash in return...bye bye Facebook marketplace for the odd new bits to cheer the kids up
Again, Paypal, bank transfer, Apple Pay etc. Completely silly to use cash for these things anyway
No more cash gifts from relatives or loved ones
Sigh.... yup, bank transfer, Paypal, gift cards, gift vouchers etc
The rest of your post is garbage frankly.