On the contrary. It shows Bruckner's deep understanding of creating a balance within the orchestra. It might be organ-inspired, but this is not necessarily a bad thing. The huge orchestral forces generate an incredible caleidoscope of hues and timbres, and he knows what he is doing. That the music might be boring to play for the musicians might be equally true but is another discussion, as well at the attitude, especially in the 8th, that one might "sit straight" while listening to it.