First off, I would do the SID on the seam lines before the loops, but for this picture I did not. See how the seams don't lie nice and flat? In the next photo I did the SID and I think it shows how the triangle shape lays nice and flat.
All edges around the colored bands are SID, giving them nice crisp definition. Again, I do all ditch work before I do the decorative stitching.
I hope some of this made sense and I was able to explain myself. SID takes more time, and often thread changes, but I think the difference it makes is worth the extra time and effort. A lot of time was put into piecing the top, and giving that piecing the extra benefit of SID to emphasize the detail of the piecing is well worth it.
So, SID is up to individual quilters, this is just why and when I do it. Thanks for reading, I appreciate it.