We are talking about financial reports though. In those Sony started to combine numbers only couple of years ago when Vita bombed out of the gates. Before that they always gave numbers for each platform (and for home consoles they give platform specific numbers again thanks to strong PS4 sales).
You can see why MS followed suit though -- look at how many incorrect headlines were generated claiming PS3 pulled ahead based on PS2+PS3 sales in the financial reports towards the end of last generation