A lot of it has to do with the fact that Snyder directs like a preservationist rather than an interpreter. It might have been a kick to see this set-in-an-alternate-1980s tale directed like an ‘80s picture. maybe. But no; we instead get a lot of slavish recreations of Gibbons’ panels.
and also direct your attention to this awesome Watchmen-Saturday morning cartoon pastiche from Harry Partridge: