I recently frogged my partner's sweater all the way back to the beginning so I could fix some issues.
Here's how it looked last year:
My first ball of yarn came from a noticeably darker dye lot than the rest of the yarn. It may not look very noticeable in the photo, but in meatspace, I really didn't like how it looked.
I tried alternating skeins, but it never looked good enough.
I also realised the collar ribbing was too wide, so I started over from the very beginning. This time, I decided all ribbing would be in the darker skein.
Boy is it demoralising to start a project (especially an extra large sweater for your partner) all the way to the beginning. I actually procrastinated on this decision for a very long time (several months) out of avoidance.
But I think it looks much better this way. And really, for something like this, it's important that I make something I can take pride in, while also making sure I'm still enjoying the process.