I want my file-browsing window to maintain a consistent presentation as I navigate. I don’t need each folder to open another window; that makes me crazy, and was one of the things I hated about OS 9 when I moved to the Mac in the late 90s. To me, the shifts under OS X — mostly, the unixy (BSD-y) underpinnings but also changes like the abandonment of the spatial Finder — made it WAY better.