You listed the risks and concluded “all generally minor.” The benefit is absolutely nonzero. So, what’s the hold up?

And how have the data not caught up? People outside the US are getting the CT scans, while US doctors prefer to lick their finger to guess the weather.

My wife’s last interaction with a doctor: patient presents with back and chest pain accompanied by occasional shortness of breath at the age of 39, doctor reluctantly asks for a EKG - which takes 5-10 minutes and is done in the next room, right away and covered by insurance with a small copay - and has the gall to be surprised when EKG showed subtle abnormalities. If she hadn’t advocated for herself, as the OP argues, doctor would just skip the EKG.

This experience left me thinking maybe doctors are discouraged from asking for imaging and guidelines are there to protect their criminally negligent behavior. I have no proof or even proxy data for the claim about doctors being discouraged from asking for imaging. But it is objectively criminally negligent to not ask for imaging in a case like this.