I don't agree

Grandma will have to find someone who can help her operate her wallet, and do transactions

Infact, the staff on any company's payroll will always be there to help grandma pull through

Learning how it works even if steadily will lighten up Grandma's life a bit

So she has to learn. The green back should go to hell. This is clearly fud, no matter how you try to define it as practicality