In the old days "about ten years ago," everyone was happy to hear from the family when they were traveling, or when the children were at summer camps and the like.
It has been the communication many people used before the mobile phone came and maybe also the way I like it most. But but we must keep track of time and therefore we do not get so many postcards anymore.
On my side you can buy a postcard
and send it on or print it out and send it, I would be happy to get it again and again.