The real issue is that half of the OS uses the desktop UI, and the other half uses the "metro" UI.
And this problem, unfortunately, extends to the settings. Which settings are in the Control Panel, and which are in "PC Settings"? Who knows? Do the settings in the metro-based "PC Settings" only apply to the metro environment? Nope. There's not a clear distinction.
The built-in metro apps are inferior and redundant to the desktop counterparts.
I think part of the problem there is they were thinking, "Well we have all of these aging applications like Paint and Windows Photo Viewer. Instead of fixing them or making newer versions, let's just replace them with Metro apps!" So you have the metro apps which are simplified. They're simplified both because the metro UI requires simplification, and because they're new applications that haven't undergone years of development.
But they didn't seem to consider that, as a user, this leaves you with a dilemma between two unappealing options: Either use the old, dated "Windows Classic" applications that have sucked since they were written 20 years ago, or go with the new underdeveloped "Metro" applications that create a jarring experience every time you open them.
Can you remember which things are under "Accessories" versus the ones under "System Tools?"
Generally yes. "System Tools" is under "Accessories" and has like Windows Backup, Disk Cleanup, Disk Defragmenter, Task Scheduler. "Accessories" also included communication tools (Remote Desktop, HyperTerminal) and other things like Window Explorer, Notepad, Calculator, IE, etc. Of course, Microsoft made a regular habit of shuffling those things around a bit with every release, but it was relatively stable for 15 years.
In Windows 8? That stuff probably isn't on your start screen, so you'll have to search for it, or else switch the view to show all the applications. The list of applications is unfortunately flat, so you can't rely on the same kind of spacial orientation that nested folders provided in the star menu.
But they just haven't figured out how to offer full-screen apps with all the power of the desktop.
And they won't be able to. On the desktop, you can already maximize windows if you want a "full screen app", but most of the time, it's extremely useful to have non-maximized windows arranged freely on the screen.