Okay, I know we just had a "nobody sends thank you cards anymore" thread, but this is different.
I sent, for example, a birthday card to my nephew with a $50 gift card inside: no acknowledgement (text, call, email, smoke signal) that it was received. Never mind an actual thank you note (which I wasn't expecting). No idea if he received it.
Same with an old friend who recently finished grad school: sent him a "congrats" card with a $25 gift card. No idea if he received it.
Tipped my stylist $50 at Christmas. Never thanked me or mentioned it during my next appointment. (Okay, that's not the same as now knowing he got it, as I handed it to him in an envelope; but it still irritated me.)
I could go on. This is happening all the time I feel, in many different contexts.
What is so incredibly difficult about sending a TEXT that says, "Got your card today. Thanks!" That takes MAYBE 30 seconds!