It could also be that people are lazy. Why make ANOTHER ROOT method when one is already available, tested, works, easy. Not many devs are wanting to reinvent the wheel. Since this might be a popular device one of the various devs may make what you are looking for, but I wouldn't bet on it. If ever you suffer a catastrophic failure pushing stock images with fastboot is the only sure way to restore from a soft brick. There won't be an sbf for RSD Lite, unless someone packages it. We will just be using image files. Not having a one-click-root method ensure that those that root should have the skills/tools to get back.
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