unfortunately, I think many IM residents (at least where I did my intern year) have been trained to think this way. If it shows up on the differential, they seem to want a test to rule it out. I had some senior residents on my services have a hard time realizing that test can include the history, physical, and clinical judgement. I had more than my share of admissions delayed to IM services (both when rotating on IM and rotating on EM) blocked because I did not have the mandatory chest xray and EKG. Not every admission seemed to need this, but the (IMHO) weaker residents would block admissions without these.
I was admitted to our univ. hospital as an intern with pneumonia. Despite meeting all SIRS criteria and having a whopping RML lung infiltrate, they still drew a d-dimer on me to rule out PE because I had pleuritic chest pain. With an obvious diagnosis (pneumonia) and no risk factors for PE (like family hx or OCPs), I would never have ordered a d-dimer on myself. And quite frankly, if it had come back positive, I would have refused a PE protocol chest CT.
When I was admitted, I refused the SQ heparin for DVT prophylaxis. I was not bedbound (heck, I went to the cafeteria for every meal because the food was so bad) and did not meet any criteria for requiring SQ heparin. Ambulation is effective for DVT prevention in appropriate patients. Not everyone needs drugs.
Summing up: you don't always need an intervention like CXR, EKG, lab tests, and drugs. It's totally appropriate in the right circumstances to rule things in or out clinically and to treat and prevent disease non-pharmacologically.