Do you want your surgeon having a panic attack in the operating room? Or a police officer having a panic attack? Or a pizza driver having a panic attack on the road? Putting the actual job aside, do you want a patient to be driving on the road when having a panic attack? I sure don't.
Put another way:
Patient A: "Doc, I have severe panic attacks about work. I'm so anxious that I have panic attacks at work."
Obviously, Patient A shouldn't be conditioned to miss work due to anxiety.
Patient B: "Doc, I have severe panic attacks due to ___ (insert migraines, nausea, PTSD, anything else besides work) and when I have one, I can't make the hour-long commute to work.
I'd argue that you're not reinforcing anxious tendencies in Patient B because his anxiety is not due to work or to the commute, but it does keep the rest of us safe when the patient isn't peeling out of a parking lot while having a panic attack.