All you need to do is go to the Colorado HS state tournament to understand why. Sure, they can get 10 mats on the floor, but the mats are right up against the dasher boards and the scoring tables are in corners or in penalty boxes. The 200x85 NHL-sized ice sheet makes the new arenas pretty tough too. St. Louis had the Olympic ice (200x100) for a short time, so their floor space is wider, which is why head tables and scoring tables at the Enterprise Center were optimal. New arenas that have hockey aren't going wider than NHL boards with their floors as much as they used to.