Just get an Air if thickness triggers your emotions that bad, jfc.
These are machines aimed at Pros, not for the average person who mostly browses YouTube, Facebook, Spotify, Netflix, and works with Word/Excel. These new machines are made to process complex data to make films, to create advanced computer graphical interfaces, to produce music, to edit photographs in various very resource-hungry demanding softwares. Of course it's going be thicker than the previous models. A new MBP is packing a lot of complex technologies necessary to do all of these PRO tasks. Quite frankly, it's impressively thin for what it's capable of.
Check yoself