The part that stands out to me is that Blizzard is using the Twitch drop to push the Housing feature, because that makes the reward feel more like a gateway than a standalone cosmetic. Four hours is not crazy, but it is enough to get people into the category without being too obnoxious about it. The extra vendor copies in Silvermoon, Stormwind and Orgrimmar make it less annoying for alts, which is honestly the smartest bit here.