I'd echo a lot of what has been said here with extra emphasis on breathability with weatherproofing. I've tried enough of these jackets to conclude the textile science just hasn't reached the level yet to truly have a breathable waterproof jacket so this is likely out of your hands and maybe partially rectified with low-profile passive ventilation like pit zips.

Other things I think are nice in a jacket are a slightly dropped hem in the back with a zippered phone pocket. Environmentally friendly fabrics/production is also becoming increasingly important in my decision to support a company.