Ask HN: Devs, how many iPhones do you own to test iOS compatibility issues?

Hello guys, every month, our small team lost hundreds of hours testing our app on various iOS and various devices. Sometimes our app will break on iPhone 7's iOS 10 but works fine on iPhone 7+'s iOS 11. A recent Safari bug made our app unusable on Yosemite and El Capitan, but works fine on Sierra - and we have to spend a ton of energy stressfully updating, pulling, rejecting, explaining to angry users, and fixing reviews.

We start to feel that the iOS/macOS eco-system and device landscape is so fragmented right now for both native and hybrids apps we're developing. Take another example, we've seen iPhone 8+'s Safari and native table view behaves very different from iPhone 7+ of the same iOS version due to timeout and performance different in the phones. It's even more frustrating consider these devices have different VRAMs.

It's mind boggling that now these days some same swift code would work differently in ios10 and ios11, and iOS development feels a lot more similar to or worse than Android development now.

We're thinking to just buy a few Macs and iPhones to make our lives easier. But is this also what everyone else ended up doing?