They want more than just features, they want to get them for "free."
We've had equivalent standards in the late 90's and early 2000's (RSS, ATOM, XML-RPC pingbacks, etc.), had open/free code for that (MovableType and WordPress) and yet personal blogging mostly died because it was easier to just post on Facebook and there was a bigger audience there.
Facebook from that perspective is "free," as in no software to install, no updates to do and no servers to pay for. Running your own install of some blogging software entails paying for it, having a lower audience and having to handle software updates (and database upgrades, plugin upgrades, templates, etc.).