By extension that's pushing the whole schedule out 2 days. Although actually - the old schedule ended on Sept 3 while the new one ends on Sept 5. I think the goal is to put as many games as possible as early as possible and hope a few series - particularly in the East - end early.
I think ultimately they wanted to front-load the schedule as much as possible - particularly so they could get lots of games on this weekend. I'm sure there are other considerations (car racing, PGA, and Tour De France) that block out either NBC or NBCSN. While they can use USA or CNBC, when you're channel surfing, people who "want to see sports" tune to NBCSN, while people who "want to see a movie" go to USA and people who want Shark Tank reruns on the weekend go to CNBC.