Just to piggyback on Shane’s comments, the caveat is what market or level of production you’re talking about. For broadcast and feature film work, editing and finishing are two separate processes performed by different people with different skill sets.
Outside of film and broadcast, it’s very different. Not only are editors expected to edit, but they are also increasingly expected to do color, motion graphics, sound mixing, compression, DVD/Blu-ray authoring and just about any other ancillary duty one might think of when producing content. Just look at any entry level or mid-level video job listing (Craigslist, etc.) for a reality check. It’s also not unheard of to be expected to shoot and do sound and lighting in addition to everything else in post. This is practically a given in many corporate video gigs. It’s crazy, but I see it all the time.
It’s really a select few at the top of the industry who have the luxury of being just an editor.