Is mindfulness of feeling the middle way?

Is being mindful of feelings in-and-of-themselves according to the triad of pleasant, unpleasant, neutral the Middle Way? Is is also auto-suggestion? Is it normalization of a distribution? Does it attempt to root out the extremes by placing us in the context of three categories? I really like the simplicity of Buddha’s model but what then about agony and ecstasy or rapture? I am happpy to do away with them, but I’m not sure how beyond lifestyle overhaul