The thing that is great about NO is that the music is largely a synthesis of everyone's creative pulse, but clearly one of them is the primary arranger, and that, in almost all cases, would be Bernard. He said that's how they wrote when they were Joy Division, and I'm sure that as his confidence as a programmer and all around songwriter grew, he naturally became the leader of the band.
People sometimes accuse Bernard of trying minimize Hooky's presence, but I think that's an inaccurate perception. The 'bass solo' in "Regret" is a great example of a band playing to its strengths. Any other band would have stuck in a regular guitar solo. I think Bernard as an arranger and a songwriter composes in a way that usually highlights everyone in a democratic fashion, unless the mood of the song necessitates spare interplay between the live instruments.
When I picked up the first Electronic album, I knew that the structure of the songs were Bernard's work, because Marr's guitar breaks or the alternate synth lines sat in for where Hooky's bass or Gillian's guitar or synth would go in a New Order song. One should not underestimate the fluidity of Bernard as a composer. His basic weakness is that he rarely puts effort into his lyrics, so either they are innately clever or spiritual or just kind of banal.