It's not a constant annoyance, but if anything there were more annoyances in the 90's around phones than having people call me to speak to my sibling.
It might have been a reality pre-00s ─ today if you want to play out any Jason Bourne fantasies, they will not be considered just annoying but suspicious, as your number gets intrinsically linked with somebody else's activities.
You mean the 'cost of interrupting other people while they are in the middle of living their lives' is near zero. On the other side of the coin, the cost of being constantly interrupted by beeping, buzzing, ringing, and jingling of every asshole in the county who calls/text on a moment's whim, and gets annoyed/offended when I don't instantly respond, is not zero.
Likewise, the cost of being constantly surveilled by intelligence agencies and evil corporations is definitely nowhere near zero.
I live completely off the grid. Far from giving a fuck about how offended/inconvenienced others are by my lifestyle, I purposely disconnected from all of those people. Life for me is much better now.
What you call "annoying AF" was reality for many many years, and yet people were not constantly annoyed..