If the police cannot just grab records and look at them why can they be notified without warrant if records are updated, it seems that that behavior is counter-intuitive to what the law says about privacy, ie the government doesn't have a right without warrant to know what I use my account for but they do have a right to know if I use my account at all without warrant. This is a contradiction to what existing privacy laws already say.

As for witness testimony, it's vastly different because they aren't solid records. I don't have the ability to be private out in public, obviously. Plus people have different definitions of privacy, I would mind if my friends or family members alerted the police to where I was for any reason even if I had nothing to hide, because this kind of behavior will just repeat and against other suspects. Suspicion doesn't imply conviction.