It could be related to increased moderator diligence in culling Apple threads today. Previously, the front page would become clogged the days new models were announced. # of upvotes on single threads is not particularly useful absent more context/ information.
Likely also related to the fact that this is arguably the first time than an iPhone release has removed a feature. The highest top-level comment in this thread is about the removal of the headphone jack, and that subthread alone has 644 comments.
iPhone 6s: https://news.ycombinator.com/item?id=10193201
iPhone 6: https://news.ycombinator.com/item?id=8292029
iPhone 5s: https://news.ycombinator.com/item?id=6361558
iPhone 5: https://news.ycombinator.com/item?id=4512316