Personally I feel that merging everything under one software is a mistake. It is impossible to be all things to all people and trying will only make the user inteface hard to approach, over complicated and messy. Your time working should be used on the task and not wandering what part of the user interface will accomplish that.
The thing that made Artworks and Impression so good and revolutionary at the time was the clean and easy to approach user interface. Everyone from children to grannies could just start doing things and it was possible to get good results by experimenting without spending long time reading manuals first.
For non English people, Impression looks like this:
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