All these things you want or dislike are theme dependent. In theory, you could find a theme that presents everything the way you want, but alas, reality raises its ugly head and we can’t always get what we want… unless we’re willing to do some custom work.
Probably the simplest approach is to go ahead and make that sticky post with your message. Then hide the objectionable elements with CSS rules added to the Additional CSS panel of the customizer.
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