Dr_FezDidn't the crossbow used to not have passive reload, and it was only rarely used because of it?
Nah, it was by far the most used unlock even before the passive reload buff. I think Mirelin was pretty much the only notable medic that primarily used another weapon than the Crossbow.
You can go back to i49 (2013) to see that it was the most used unlock by top medics. Hard to find any information before then as logs were not as detailed.
http://logs.tf/search/log?s=i49
EDIT: For reference, the passive reload buff was added two months after this LAN.