Oh yeah, I've been supporting a large Angular project moving from 1.5 -> 2-beta -> ... -> 7, and every, literally every new version has been a huge headache somewhere in the bottom of back. This was mainly due to the complexity and layers of legacy code in the project, especially in manual-tuned building pipelines, but come on, this is real life, not a startup from scratch. After many years of struggle and adventure, after losing my hair, I moved to React.