A gate-keeper who keeps the riffraff at bay with little supervision provides solitude. CNID is equivalent to a hazy peep-hole. You can sometimes see who's ringing, but they can just keep on ringing. The needs and rights for solitude that residential customers have is greater than that which businesses have. The future solitude of a caller depends upon their ability to make calls anonymously.
Solitude requires anonymity.
We can have both or neither, and by attempting to balance the two we will wind up with neither. On Software Changes As software engineers, we have broad experience with user interface changes in complex systems. We find USW's cost estimates for their software changes incomprehensibly high. Consequently, if USW's estimates for minor modifications are accurate, CPSR shudders to contemplate the costs USW will ultimately attempt to recover as other trivial problems with SS7 technology arise that need attention. With no specific motivation it might take years to get a minor switch software change from Bellcore and the switch vendors.