Many users don't see any particular reason to change out the stock firmware for AOSP-derived offerings. OEMs for the most part are now taking things much more seriously, and their firmwares are pretty much usable unlike a few years ago. Some of you might remember how “fluid” Eclair was on some devices, which illustrates the past problem with skinned ROM performance.

A pre-rooted stock ROM is still a good choice for many users, as it offers all the device-specific features along with the power-user friendly goodies of root. While copying the requisite files to make a ROM pre-rooted is easy as pie, extracting the stock image isn't. If you want to extract a firmware for Sony device, you need to use a Flashtool and lots of time waiting for the output. Those of you who want to have a pre-rooted stock ROM made in just few simple moves should try the tool written by XDA Senior Member zxz0O0. PRFCreator is a Windows-only tool that creates a pre-rooted stock image in just few clicks. The output file can be flashed right away onto your device.

To get the flashable.zip you need to have three elements: a working FTF file with a firmware to your phone (you can create it yourself with Flashtool), a SuperSU package, and a dual boot package. You can get them from the resources provided in the thread.

You don't have to wait for someone to root a stock firmware for you. Do it yourself, since it's very easy. Get the app from the PRGCreator thread and give your Sony device a pre-rooted stock ROM.