One man's shortcut is another man's efficiency. Everybody does more with less. My shift has been down 3 detectives for years now due to a period of not hiring, the streets getting short, and no replacements available for invest. I worked about 250 hours of overtime last year. So, yes, if I can find more efficient ways to accomplish the same thing I'm going to do them. Let's say I'm working a serial robber who hits pharmacies. The shortcut can be to track his cell phone, set up geofencing, and when he gets close to a particular pharmacy have an alert go off on my computer. Alternately, I can tie up about 4-5 UC guys to follow him around for days or weeks. Yes, the result in this investigation is the same. However, that's warrants that aren't being served, surveillance that can't be done electronically not being done, etc. etc.
Tone can be difficult to convey in writing, so I want to make it clear I'm not trying to be condescending or belittle anyone's opinion. When you are a laymen, you really have no idea what is involved in an investigation. No more than you'd tell the pilot how to land the plane in the safest manner, you can't really assume you know the best way for me to do my job. There is certainly a balancing act between civil liberties and providing a safe environment for us all to live in. However, when you look at what COULD be done or how something MIGHT be abused, you are looking at things like gun control activists look at firearms. Everyone has input on how law enforcement interacts with the community at large, what the laws are, etc. However never make the mistake of thinking its simple enough to be resolved with no experience and no knowledge of how things really work, nor get trapped in looked at only the negatives or hypotheticals.
**to be clear, my state requires a warrant or subpoena for cell phone information unless you are calling 911, in which case your location is automatically revealed.