Finder is pretty good, and it's handy to be able to open it from the terminal. But I find it super annoying it litters everything with .DS_Store files and there is no way to turn that off, except for external and network drives. Aside from, obviously, using a different file manager. Very un-Apple.
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The .DS_Store files are not Finder specific; Apple treats everything as a file (including folders), and it exists to supply folders and the files within them with metadata.
It is just the first time the .DS_Store file is needed is often when the folder is touched by Finder.
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Actually, .DS_Store is very Apple indeed (not that I care much).