I don't worry about making a quilt perfect -- if I did I would not ever finish anything. I always try -- and if it is practical to reverse sew, I do so.
I use the 5' rule for simple things like points (unless they are easy to fix), but I could make quilts out of the blocks where the color looked off with the rest of the quilt when I started putting them together. (Maybe that's where sampler quilts got started. LOL)