I agree that it is a different world. Cards are bad for the environment, costly to buy and send, and a bit pointless when people can text or leave a message on social media. A lot of young people have stopped buying them for that reason, and whereas I sympathise if you are disappointed, I don't blame them.
I think that they are dying out as a 'thing', as is the emotional blackmail attached to sending them. I remember when I was a young woman and my (lovely) MIL expected me to send Easter cards to her neighbours, who duly sent them to us. I have never sent Easter cards, as I am not religious, and said that I would rather not. My MIL bought them, wrote them for us if necessary, and posted them herself, because she said she knew that the neighbours would be hurt if they didn't get them.