Control panel is based on a very old programming API. The new Settings items work in a totally different API, the old API is going away. It will take some time for all the control panel items to be migrated to the new Settings. It really is not productive to complain that Windows keeps changing stuff, because that's the whole point. Windows is going to WinRT for everything, and nothing will stop that. Microsoft is not going to go backwards on this and bring back stuff they've already converted.
Consider it like this. Let's say the company you work for has decided to build a new building next to the old one. The idea is, everyone will eventually move to the new building and the old one will be torn down. As the new building is completed, story by story, people move to the new building, and parts of the old building are dismantled.
Soon, some people start complaining because they have to go from one building to the next, and they can't work this way for the rest of their lives... Which is of course silly because they won't be working that way for the rest of their lives, only until enough of the new building is done that they won't have to do that anymore. However, those people keep insisting on acting like the two-building approach that is happening now will be that way forever, despite being reassured that it won't be.
Next, another group of people start complaining because the Cafeteria moved to the new building. Not only do they have to go to the new building to get their lunch, but they don't like the new paint and layout of tables, at all. This is a disaster they say. Why couldn't we just keep the Cafeteria where it was? Ignoring of course the point of the whole exercise is to move everything to the new building, keeping two cafeteria's going would be expensive, confusing, and require twice the staff. Plus, you don't know how many people will go to one vs the other, so you have to have enough food for everyone at both cafeterias. It just doesn't make sense to keep two of them, plus the old cafeteria will eventually have to go away anyways.
Now, another group of people say they refuse to use the new building. The old building did everything they needed. They won't go to meetings there, and they won't move their themselves. They don't like the design, and they will just stay put. They can't understand why They're being required to do things over there. They'll just stay there forever, they can't make them move. Plus, the new building is farther away from the parking lot (never mind the fact that a new parking ramp will be built on the spot of the old building that will actually make it closer when completed).
So I guess my point of all this is.. You're just not going get any traction on complaining about moving parts of the OS to WinRT, it's happening, and will continue to happen.
I like the minimalist approach myself. However, it's quite easy to change the eye candy. There are already a number of examples of how to do so, and there are tools to even bring back Aero glass. I really don't understand your complaint because what you're asking for is already possible.
[I]
The start menu in 9926 was an interim start menu. The Menu in 10041 is a lot better in many ways. Sure, some people still don't seem to like it. However, Microsoft gets a lot of flack no matter what they do. I can't count the number of people in these very forums that complained incessantly about the horizontal scrolling of the start menu. Well, the new one is vertical... And I guess that's not good enough either, now they all want to go back to Windows 8's start menu.
All it goes to show is that you get used to whatever you use. You may hate something at first, but eventually people get used to it and they grow to like it. So when you change it, they want it back.