Don’t get me wrong, I’m all for using single-patch surfaces, but in my opinion they are useful mostly where the project is really important and the time frame and cost are not set tight. I often break the Class-A rules in my workflow, because time pressure is what makes me choose shortcuts wherever possible. 
I admire your dedication and the time you can afford to devote to optimize your surfaces. Basically 2/3 of my work could be considered “low quality” by the Class-A gurus 
, because I’m a heavy user of multi-span surfaces as they let me save time.
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