I tend to like pouring hot brewed chemex of home roast into my dry hopped stout. tannins and acid arent so much an issue as long as you brew with water at the proper temperature. for me, a medium roast fruity bean shows its flavor best when brewed hot and pairs well with a tropical dry hop. if you're going for a dark chocolately stout, then a cold brew of a dark roasted earthy bean will work better with that i agree.
as was noted, modern times brewing swears by tossing freshly roasted whole bean coffee into the fermenter. the co2 outgassing from the beans wont harm the beer.