Worked in a company that had a lot of problems reusing code / UI across many similar iOS apps. Current devs were basically trying to build this: https://jasonette.com/ (after other multiple failed ideas).

I argued for weeks after joining that this is way too much, with better use of storyboards and autolayout we can fix the majority of our problems. They did everything short of laughing.

Few months later managers in my office were tired of them so gave me a chance, I build an app my way, the most senior of them build an app their way.

Long story short, my app was a bit more complex, both had the same amount of time. I finished 2 days before the deadline, he went 8 weeks over.

Never felt more vindicated in my life. Mysteriously he and another dev randomly "decided to leave" 2 - 3 weeks later.