When it’s voice only my kids will still try and show a picture to the phone, etc. and when we tell them it’s just voice and the person can’t see them they just ask why not.
I’ll add my own memories to the anecdote: when I was a kid my dad’s family would call from overseas. Even though my Arabic was passable, my grandma wouldn’t get more than a hello, I love you, and I miss you out of me. Why? The sound quality sucked, the timing was off, and I couldn’t really picture my grandma in my mind while talking. If there had been FaceTime in 1988 it wouldve been a different story. In 2005 my Arabic was WAY worse but our conversations way more expressive even with crappy video.
I travel a few days a month, those 15 minutes of FaceTime when I get back to the hotel probably do more for me than them.