If you've come across a doctor that doesn't examine well or take a good history then you should be suspect. That being said, it's often difficult from the patient perspective to realise what a good history/examination or set of investigations for a particular presenting symptom is without a medical degree. A lot more goes on in the background than just what you see, if we're looking on a computer, we're probably rechecking your known medical history, previous exam findings, investigation results or triple checking a treatment regime which are often in flux with current guidelines. In my practice, I'll check a treatment regime or dosing with guidelines even if I know it off by heart. I teach my students/juniors only to learn the emergent drug dosing and to look up everything else, it's just another layer of safety.
Back to the OP's question:
Why do people choose medicine?
Lotta reasons but the ones who do it for money leave quickly, we don't get paid enough to deal with the shit we have to.