PM splitting is not complain, it's a feature I need since a lot of my members don't open new PM but continue writing in existing ones. This is bad and I know it's comming from facebook where Conversation is all one, but that's the truth.
Also I expected new and/or improved functionality which I haven't seen yet IIRC
Contemporary design is good and really welcome but it's now going to refresh our sites just like that.
Simplicity is one thing, I can give you that, but organization / statistics-analytics is another.
My community is small so I don't really mind it that much but for big communities it would draw some conclusions seeing stats like that. After all the reasons for reports (as well as warn) are more or less known to everybody, that's why I think they could be standardized.
I've said that in the past somewhere, sending a PM related to the REPORT or WARN system is important not only for convenience but most importantly to link the PM with the report or warn (that is back and forth no matter the screen).
Now I just send if necessary a PM that is later trackless through endless other PM conversations...