That is interesting. I guess I agree?
For the color, I do not use a color wheel and go by how it looks to me. On the old What Not to Wear they used to say "It doesn't have to match, it just has to "go" That was about clothes but, I still think it applies.
I use all kinds of threads for piecing even black and white depending on what I am making.
I still do my best to match intersections and keep points. Mostly okay and then I think when it is quilted and washed, then no one even me will see.
I love to FMQ. I am not the most proficient but am "supremely adequate" as a friend used to say about things. And when I look at beautiful FMQ whether by sewing machine or long arm, I love it, and love to do it on my Brother PQ1500, and only other quilters seem to appreciate it. I have never given a quilt where the recipient says "that is beautiful quilting - how did you do the feathers?". They say "I love the colors". But I still love doing it. Nothing goes in a show.