Assuming you are referring to the version of Adobe Audition released around 2010 (CS5.5), it introduced a pivotal change to the software that was arguably its most helpful feature:
Option 2: The "Tech Comparison" (Best for Blog Posts or Tech Groups)
While the Premiere integration was new, the was (and remains) the most helpful unique feature for audio restoration.
It was a year of transition. We were moving away from the old-school destructive editing workflows and seeing the first real glimpses of the powerhouse Multitrack environment we use today. For those of us in radio, podcasting, or post-production, 2010 was the year we realized that "Cool Edit" was officially a memory, and a professional titan had taken its place.
The shifts that occurred in 2010 defined the modern DAW landscape. By moving to the model and adopting a cross-platform engine, Adobe shifted Audition from a niche recording tool to a vital part of the video post-production workflow.