Currently, if you didn't know about a circumstance, people forgive you and generally understand. But, if you took the time to find out this information personally, this would have meaning, showing that you cared enough to spend the time to check. When you send flowers, the act can often have much more meaning. However, if everyone has apps that remind them of such things, you would no longer appear thoughtful, there is no longer as much meaning. We are already seeing this to a certain extent with social media.
This is the point. Is it worth the small gain in time, for the loss of some aspects of meaningful human connection/interaction?
"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?