EDIT: Article talking about it back during OS X 10.0 release http://archive.arstechnica.com/reviews/01q2/macos-x-final/ma...
Couple reasons:
1. It preserves the metaphor of your desktop being a place where you can directly manipulate your files and folders. On early Mac versions, the Finder "was" your files, it wasn't just "a browser for" your files. That metaphorical consistency is very important for building a good UI, but products these days have gotten so complex that most of them lose it.
2. It prevents you from getting into a situation where you've opened up a bunch of Finder windows, navigated through them, and then find that they're all pointing at your home directory again. Ironically, the reason Steve Jobs gave for the new MacOS X finder was that the old one popped open a bunch of windows that you'd have to manually "garbage collect", but I feel like I'm garbage-collecting a lot more on MacOS X than on System 7. The reason is because on System 7, the Finder window I had open was a natural extension of my current task and I just closed it when I was done with the task, while in MacOS X, I just usually have one or two windows open and then periodically feel like they're a distraction that's getting in my way.
I don't see the difference. When I open Finder I see _my files_, I don't even think about the Finder as a browser.
So, yeah I miss the spatial finder too, but after 10+ years, I have gotten over it. People blow this out of proportion.
Or are you referring to the files themselves? So if you open up somephoto.jpg in Preview, you couldn't open it up a second time?
I'm struggling to understand you here.
I'm not necessarily siding with the parent post, but I think the point was fairly clear.
23 years later and I still can't consistently switch off "browser view" in the OS X Finder. Cmd-option-T works for windows on my local disks, but then I'll insert a USB stick or similar, and they appear as standard in browser view. Ah well.