[rimliu]

I've inherited an Swift app once that was written by the dev for whom it was the first Swift project. IUOs everywhere. And the biggest contributor to the crash count. Spend six months cleaning it up; the crash rate went down dramatically. It is not wise some value will always be there when you do not control its source (e.g. API).

[saagarjha]

> I've inherited an Swift app once that was written by the dev for whom it was the first Swift project. IUOs everywhere.

Right, hence why I'm suggesting that they can be useful if you don't put them everywhere and aren't using them as a band-aid to make your code compile :)