Just got back from my CDT hike and saw this thread. I am excited by the design of this pullover, though I like hoods, so I think i would want one and I know that adds complexity to the design and extra weight in drawcords.
I wanted to say that I switched from a Marmot Precip to a non-breathable, cuban rain jacket from Zpacks about a quarter of the way through my CDT hike and I couldn't have been happier. Joe puts fairly long pit zips on his jackets, the hood fit well, the jacket was long and went 6 inches or more below my waist and it weighed 4.5 oz. The pit zips vent really well with a wicking base layer (LS smartwool for me) and since I had the luxury of an umbrella I generally hiked with the front zipper half way down and the hood off except in fierce wind. I get sweaty in any rain jacket while climbing, so I don't think it really makes a big difference, just walk slower if not in a hurry to minimize sweat. I like that I can wear it over my down puffy in camp while setting up my tarp and I know it isn't going to leak like my breathable jackets always do after being worn all day.
This isn't an ad for zpacks, I have no affiliation with them other than I am happy with all the gear I have purchased from Joe the last few years, I just wanted to let everyone know that a non-breathable jacket with pit zips, a long zipper, and careful temperature regulation can be just as comfortable as a breathable jacket, less weight, and more reliable at protecting insulating layers.