People are complex. It's difficult, if not impossible, to know for sure whether they do things like cards and gifts because they have to, because they want to, or a combination of both. The only ones we can be sure about are ourselves, and not always then.
I love Christmas cards. I don't mind a "box card" with just a name on it. That person took the time to get the card and address it (and buy a stamp for it), and I appreciate that. He or she certainly didn't have to. I'm getting a lot of e-mail family letters, too, these days, which I print out and put in the card basket.
Yes, they all get thrown out eventually, but most things do.
Many people use FB or other social networks for Christmas or birthday greetings, and I don't mind that either - at least they're giving me the time of day, which (again) they don't *have* to do.
But I enjoy real cards best, I think, and the artwork on some of them is beautiful.
I like sending cards/family letters and have made my own for several years (I'm not particularly crafty, but I have a system). When the children were little, each had a turn doing the artwork. We put pictures in every year. Now they're grown up so I do my own thing, occasionally with a photograph enclosed. (My husband pays for the stamps - that's his contribution).
When we first married I decided I would *always* send Christmas greetings to *all* the relatives, whether they paid any attention to us or not; most of them haven't - they're scattered all over the country and have their own lives. Last year my FIL died and I met some of those relatives for the very first time - and some of them said, "I've really enjoyed getting your cards over the years!" Who knew? Life is funny.