For now, that is. Later, the government will claim that they absolutely need this information for, well, take your pick of reasons.
The government always abuses everything, eventually!
Today, when the government demands such data, they need a warrant unless certain conditions are met (like being in a terror cell).
They cannot demand cell ownership data from a carrier without a warrant, which is why the data is stripped to use it for counting cars on the highway.
Your phone constantly broadcasts it serial and other data, that's how cells connect and bills are sent, and how bootleggers steal your phone ID and load it into another cell, so you get the bill when the stolen phone is used.
So, because it could be expanded in the future, it is completely bad now? Sorry, that is a bad reason.
Firearm owners have battled this for decades. We provide all sorts of information in order to purchase firearms, but have successfully fought every attempt at creating a database of personal information.
Firearm owners know that the price of freedom is eternal vigilence. You can never rest easy.