It was, you often could see JS error messages or weird rendering errors / flickering (Also some other mentions: https://news.ycombinator.com/item?id=20892650 ht

It was, you often could see JS error messages or weird rendering errors / flickering (Also some other mentions: https://news.ycombinator.com/item?id=20892650 https://news.ycombinator.com/item?id=20892650). There's also some parts of System Settings that were always web views, which I always found surprising for a company trying to make the case for native apps.