Hello.
Most non-casual games are healthy in this definition. However, respectfully, I would not say RTS has a lot common with real planning abilities, nor it is beneficial for playing skills, and vice versa. It might keep memory from some kind of degradation, though as games rely on visual-sound perception only, it barely can improve. In term of socializing, it is true, as the game is being an identity agenda and so, is a basis for building a social group (community) around it. The fact of common responsibility within the group, as well as in any other, might help in real-life situations.
In my take, the RTS is not a strategy simulation in literal meaning, and there are not any.
As for me, I would value the game by it's historicity or a well written lore, because it is a kind of art and retains its qualities.