I’ve thought about this, and my kids hear “I love you” literally every time they talk to me on the telephone, and hear it twice from me every time I put them to bed, and have their entire lives. When they were little we also had a very elaborate game that evolved over time that took 2-3 minutes, that they loved. They are teenagers now, and we still have a routine, even though it has been shortened greatly.
So there is little informational content to this phrase.
Instead, my take is: tell my kids to be brave. It’s OK to cry, but there will be a time to move on. I’ll watch over you if I can.
If I only get out the first line, well that’s enough.
There is little enough love in this world as it is. Surely families can manage it, if they merely make it a priority? No one you love should ever not hear it from you constantly. We are ships traveling in the fog; it doesn’t take long to drift apart.