Yep. This is the exactly problem - these stop-and-search with dubious probable cause excuses are all about hitting their numbers without having to work too hard. They are "fishing expeditions".
If you have been pulled over for seemingly no obvious reason, they are looking to find something to arrest you for already.
Just new reasons for probable cause, with the same goal: to write tickets and make arrests. I don't want to say all, but many (and in places, most) traffic stops are about hitting quotas and not about public safety.
This sort of stuff gets conveniently remembered when someone is being persecuted (sometimes for good reasons in the case of a serial killer or organized criminal, or for bad reasons like someone who is just being critical of a public figure).
I for one hope to one day drink wine with my wife while watching movies in the back of our self-driving car, on the way to Disneyland from Chicago.