From my reading, Forstall was one of the few who actually refused to partake in performative corporate culture, and decided to quit rather than bend over

>when Apple issued a formal apology for the errors in Maps, Forstall refused to sign it

It's obvious that apple maps would never be able to be a perfect replacement for google maps at launch, and it's possible Forstall in fact voiced these exact concerns but was overruled before launch, only to then be used as cannon fodder when he turned out to be right. Given all the clearly empty corporate-style "we take full responsibility" stuff you see today, someone actually _refusing_ to play those games when it wasn't his fault is a very positive sign for authenticity.

(He also did work on Siri, but given that he was booted right after its launch, I don't think it's fair to attribute their present incompetence on that front to him.)