Moments are the same thing as Events (every photo was in one and only one Event, now they are in one and only one Moment). You just cannot create the 'Events' anymore yourself, you cannot decide which images they contain and what they are called and you cannot their order or put them into folders. Moments have the same function as Events (they are the primary organisational structure for your images), you just don't have control over them anymore.
Events in iPhoto are what Projects in Aperture are, what Finder folders are for all types of files, what 'imported' Finder folders in Lightroom are. They are the location where your images are, same applies for Moments. You have just been 'relieved of the burden' to create them and to name them (no more dozens of 'Untitled 1', 'Untitled 2', etc.).
You just contradicted yourself. You say moments are the same thing as events then go onto stay how they are different. Moments only have half the functionality that Events have.
Events could be named, I could choose what photos were in events, I could change the order - I had control over them. Photos is so half arsed in its implantation that you can not do any of that, and its fairly rubbish if you've been a loyal iPhoto user for the past 10 years like I have, you can not continue your last 10 years of organisation of photos in a logical way. However I guess thats the Apple way - destroy everything that works, implant a half baked solution and then over 5 years slowly add in the missing features, only to start again to loose functionality again. (Aka iMovie, Aka Final cut).
There has been no 'Relief of burden' - Its just made everything more complex. Apple should have maintained functionally in iPhoto, even if it had to be turned on via a menu.