Just a thought on the “recommended” for temp range–it really does depend on the user’s jobs, too. E.g. likely if in hotter room, and running only short jobs intermittently, you may never overheat, and if in a cold room & consistently running 1 hr+ jobs, you may have overheating issue… as well as variable of how users choose to vent & thus different types environmental conditions due to that.
So for the intended market, “recommended” is appropriate. Now if this were a designed as & marketed as an industrial machine, then I agree that “recommended” is not strong enough language.