I just used that as an example because it's free, high quality, a good reference, and goes beyond what you would expect out of a style guide and is closer to a textbook on technical writing. So just replace it with your preferred technical writing manual—although a lot of them tend to call themselves style guides or manuals of style.

Either way, it's an avenue of learning to write that ignores, I would say, all the artistic aspects of writing. Inasmuch as you can say anything "isn't an art."