Because there's a dumb culture of treating people who left like they're from beyond the grave where you have to divine their intentions like some programming ouija board.
I broke that unspoken rule and got a really intractable problem that held us up for days finally fixed by making a short phone call early in my career and told myself if I was ever causing what we were going through I'd want to make it clear that I'm open to that rule being broken as well.
Apparently even suggesting such a rule should be questioned and to try human solutions to human problems is met with mockery and disdain. Alright, cool.