Yea, they can do a visual check on your license and registration and insurance, they don’t run your plate or your license until you provide or they find probable cause.
They can make a visual assessment of your car. They can casually question you and make assessments about you.
This was in a licensed, registered, insured, new, and clean vehicle. No tinted windows or anything like that. No ridiculous bumperstickers. Just an average citizen, wearing a suit, on the way to a business meeting, during daylight hours.
Treating everyone like they are "wanted by the law" and later releasing the vast majority who are simply going somewhere is not effective policing. It serves to create mistrust since these guys only HURT MY BUSINESS by making me late with clients.