10-ish years ago, it wasn't possible to retroactively subpoena a year of minute-by-minute location history, because unless you had an ankle monitor, that data didn't exist. You couldn't get a letter-by-letter log of every term typed into a search engine or a log of the amount of time spent looking at pages of reference material. You couldn't get a record of every keystroke ever typed into a mail client or word processor. You couldn't get every photograph ever taken by the individual, because cameras didn't automatically send a copy to the mothership. This is way above and beyond standard paper seizure or record demands.
"Write angry letters, but don't send them" used to be good advice, but now that the government can just casually dash off a search warrant to produce every keystroke and every location ping within a year of a suspected crime, we all have good reason to be scared. Why'd you search "marijuana" that day last October? You expect me to believe you were just researching a ballot measure? Pfft.
This makes Big Brother a tangible reality. It certainly feels big to me.