My favorite is when the designer doesn’t have a good idea of what’s feasible to implement on the target platform and just designs whatever, leading to a boatload wasted time.
Don’t get me wrong, I have a ton of respect for good designers, but the best designers are those with a slight technical lean who are willing to design around e.g. built in customization on UIKit widgets instead of full wheel reinvention everywhere.
>>kitsun+(OP)
One of my favorites was when a designer decided to use a grid system completely independent of what was going to be used in development. No time left to redesign, so the designers had to live with whatever the devs could make happen in the time allotted.