This is fine for Mac apps, but Apple can kill iOS apps dead for this reason, while letting their own deviations slip through unimpeded. In general, though, I t

This is fine for Mac apps, but Apple can kill iOS apps dead for this reason, while letting their own deviations slip through unimpeded. In general, though, I think interface guidelines are like the rules of grammar: when you understand them well enough, you understand when it's okay to break them. Whether the change to the three upper-left buttons falls into this category is somewhat subjective.