"Meaning" always exists relative to a background. If the average person doesn't remember but you do, you stand out, and your actions have extra meaning. Just because the background decreases doesn't mean you can't stand out. You can always go beyond what the app suggests; for example, in additional to sending flower you could appear in person and sing to them.
This is the point. Is it worth the small gain in time, for the loss of some aspects of meaningful human connection/interaction?