Maybe, yes, but you have to consider what is below it.
A header transfers loads to a concentrated center at the posts that it sits on. The full load of the header is transfered down the post to whatever is directly below it. When a load is spread out over the span of a wall, The load is distributed. This changes the load dynamics of the structure and can become a great problem. Adding studs in the walls below and pillars under the floor is not extreme measures. It's necessary.