I'm using Xcode 9.2 now. I gotta say, testing on my iPhone and iPad is just a real drag. I think I spent 90 minutes minimum yesterday wasting time trying to test on either device. Keep in mind, I'm no novice (been making apps since iPhone 3).
Whether I try deploying via a connected cable or via network, its always one thing or another that fails. And sometimes the errors are within a minute of a successful build. "Xcode will continue when connected" is probably the most frequent problem.
So I'm curious devs. What do you think your success rate is for simply getting your app onto your device?
Right now, I'm feeling like 1 in 4 times I have no problem.