Why use an external editor?

I have done a search on this basic question, but everyone is at least one step ahead of me. I found lots of questions about using external editors, but none on why to use one if the first place.
It's self-evident that the basic answer is to extend Aperture's capabilities. So let me narrow the focus of my question as follows:
1. Just out of curiousity, there must be at least some overlap in things that Aperture does and what the external editor can do, correct?
2. Can you share some guidelines as to when you would stay in Aperture itself and when you would  use the external editor through Aperture?
3. An obvious question is why use Aperture when you have an external editor?  The most likely answer is that Aperture does some things better, and the external editor does other things better. So does it come down to experience in deciding which program to use for what? As someone whose post processing has, for years, been limited to cropping, that's a pretty daunting reality. Any advice anyone can offer to offset my inexperience would be appreciated. For example, someone on a share-your-image type forum just blasted me when I posted something labled as my first effort at using a RAW file. I made "local" changes here and there in the image. He told me I'm doing things "totally wrong" and I should make global changes, and avoid making local changes. I don't know if he's right or not, but if he is, how was I to know that? So again, any advice for a PP newb would be great.
Thanks!
Ben

Good questions, Ben!
And probably the answers are a matter of taste and personal preferences, and depending on the workflow we are using.
2. Can you share some guidelines as to when you would stay in Aperture itself and when you would  use the external editor through Aperture?
For me, the escape to an external editor is an occasionally necessary evil, if I really need to do things well, that Aperture cannot do.  The problem is, that using an external editor will break Aperture's lossless workflow; it will create an additional original image file, and Aperture cannot undo the edits done in the external editor. And the additional original files will be gigantic 16bit tiffs or PSD files. So I would never use the external editor without a pressing need.
I use an external editor, if I need to create images with transparency or do advanced retouching that requires the composition of two or more images. That are things that Aperture cannot do.
Or, if I have images that need lens correction or perspective correction.
3. An obvious question is why use Aperture when you have an external editor?
I use Aperture first of all, to keep my images organised - my Aperture library is my database of all photos I have taken during my lifetime.
And I use Aperture to edit the images and to keep track of the edited image versions and how they relate. For 99% of my image processing needs Aperture is sufficient and great.
-- Léonie

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