Early in my crochet career, when I was timid about the weaving in of ends, I frequently worked in one color, and while monochrom is clearly no longer my preferred mode of expression, the use of one color does have a place.
For stitches that provide a rich texture, the use of a single, solid color can serve to highlight the depth and complexity of a stitch, and I think that the use of a color I think of as granddaughter pink in the project pictured shows that:


When first learning to crochet, the advantage of using a single, lighter colored yarn is that the stitches are easier to see; this is, as it happens, also a weakness to using a single, light color as any and all errors are readily visible.
I learned this the hard way when I made this blanket.
Before I learned better, I used to go for long stretches without carefully inspecting my work, and I did so when I was working on this project.
At some point, I decided it was time to take a break and admire my work, when, to my horror, I found that there was a misplaced stitch that was a blight on an otherwise error-free expanse of pink. For almost an hour, I wrestled with whether I should pull out the many, many yards of yarn (two 100 gram aran weight skeins’ worth), or just push forward and finish.
By the time an hour had passed, and I had not yet made e a decision, I realized that my inability to decide meant that I had to unravel the yarn to the point where the mistake had been made. I knew the hours of indecision would amass, and at some point, enough time would have elapsed that I could have pulled out the stitches and redone it two or three times.
Since I have not yet learned to be sanguine or philosophical in any useful way when I make crochet mistakes, I have at least tried to learn to look my work over more carefully and more often.