ExploderWizard
Hero
Obviously weird monsters aren't familiar humanoids who have just gained a massively powerful new ability, so that's not what's being discussed.
What humanoids are "familiar" to new players?
Sure, but this is bad design, even accounting for that.
You know this due to extensive playing with these rules eh?
That's the precise opposite of this. The natural assumption, having played 3E, would be that high-level fighter-like monster WOULD have multiple attacks.
The guy was coming to 3E from 1E. The natural assumption was a single attack per the 1E MM.
Here, the natural assumption is that ganging up on a PC might gain Hobbies some minor advantage. Not that it would MORE THAN DOUBLE their average damage, or take it to the point that they are virtually certain to down most PCs in a single hit!
Do I have to explain what can happen when we assume?
This is just condescending nonsense. The Hobbie ability is virtually pure metagame. The answer to it is metagaming (tight focus fire, particularly - not something real people use in medieval-style combat, typically - it's extremely dangerous, because IRL, you have to concentrate less on defence to attack someone who isn't threatening you when there are other threats to you - I'd have no problem if this required the other Hobbie to be un-threatened, btw).
Luckily not everyone thinks like this and the roleplaying hobby is not doomed.