This is a subjective issue, of course. Personally I find autocomplete and navigation in Xcode still sorely lacking compared to IDEs in the Intellij family, to

This is a subjective issue, of course. Personally I find autocomplete and navigation in Xcode still sorely lacking compared to IDEs in the Intellij family, to the point where I happily pay for AppCode to do most of my iOS work (basically any serious coding, although I return to Xcode for UI work). I will concede the AppCode can be sluggish at times, though, which is my major gripe. Conversely I find Xcode more buggy: every other version seems to be plagued with crashing bugs. As for the idea that Google should start from scratch: that would just put them back a decade. I'm very glad they decided to build on an existing great platform instead.