Midtones, in most photographs, are where the interest lies and the primary exposure should be made to optimize this part of the print. The B&D should be relegated to the extraneous or problematic parts of the print -- these are corrective measures, not the prime printing technique.
I have seen in my observation of SG printers that they often use half a dozen dodges and burns when a simple correction of contrast grade and maybe one dodge or one burn in the highlights and shadows will result in a better print.
SG does a good job of finding a contrast grade that will produce the sophomoric 'bit of pure white and bit of pure black' in a print. Where the rest of the print ends up is a crapshoot - sometimes it is OK, sometimes it is not.
There are many ways to get to the same result. SG isn't neccessarily the optimum path but is just one of many. Finding the right contrast grade can be a real problem without good instrumentation and SG does a reasonable job of making a first determination.
If it works for you, and you like the results then by all means stick with it. I found it constraining and requiring a lot of correction.