*Old Man Voice* You darn kids today and your dart spreads, your healing grenades and healing gas.
Why back in my day we didn't have no fancy Mpsevenums or level 6 perks. The syringes we had required you to be aiming directly at the target when the needle actually touched the skin.
You young whipper snappers don't know the meaning of "hitting the player directly".
Nah seriously, I feel the Medics job as a healer is already very spammy, and easy to do. I tend to find I can pump out heals very efficiently and its only really the instant frags that cause issue.
Giving the Medic a spread weapon would kill off the actual skill required to be a Medic, which given the way it used to be I already kinda miss.
Although there are those fake hits with the Mp7, they are almost always what I call "glancing blows". If you nail someone dead center then 99.9% of the time its fine, its quite managable if you keep practising with it, you'll start to get a feel for which darts will miss and which darts will hit.