The editors do editing, the cameramen do their thing, the audio editors do theirs etc. Same goes for their video editing software, if you think about the film and music industry, each team has their expertise.
Avid Pro Tools excels as being good at just mixing when it comes to workflow and how older studios were setup quite literally but in digital environment instead. He describes Avid as the type of company who creates software and hardware for very very specific niche usage. My brother works in the film industry and is a frequent Avid user.