While i can appreciate the pessimism and wouldnt be surprised, i think they are delaying the release because this may make or break D4 going forward.
We had beta and then 1.5 months of sorta-kinda beta, so they have had plenty of realtime data to work with and plenty of complaints, so im sure they wanted their team to get plenty of rest over the weekend before the community treats their chest like their personal toliet to take a dump on patch note day if these notes just suck.
Really hoping for some actual QoL changes plus some actual changes to gameplay for each class, or this ride might already be over.