Well, lads and lasses, some of us have it figured out (well sort of).
WPB poncho for warmish weather (hard to beat the breathability of that combo). When really warm, just get half nekked and wet (provided you have dry clothes for backup)–feels good and cools you down a bit.
Paramo/Furtech or preferably a separated Pump liner with windjacket for colder weather. None of these are "perfect", but what materially is perfect in this world? Meanwhile, quite good for their respective conditions.
Course, even these could be improved and tweaked. Tis the nature of the left brain and of masculine energy side of us to try to constantly change, improve, figure out, add order or knowns to chaos or the unknown (this btw, is NOT a gender statement as we all have masculine and feminine within and all have and use left and right brain hemispheres). This in large part is what science is all about and fueled by.
Course, it needs some balance from the other side like acceptance, seeing things from the big, holistic, or long term picture, intuition, feeling awareness, getting still or receptive, appreciating beauty, etc. But try talking about these things to gear heads, in a male gender majority, etc, etc…. When the eyes start to glaze over or the mouth starts to twitch, or stones start flying, you quickly realize it's a waste of time.