"iOS reloads PWAs every time they get on screen"
See: https://medium.com/@firt/pwas-are-coming-to-ios-11-3-cupertino-we-have-a-problem-2ff49fd7d6ea
And: https://stackoverflow.com/questions/6930771/stop-reloading-of-web-app-launched-from-iphone-home-screen
"iOS 11.3 update"
See: https://medium.com/@firt/progressive-web-apps-on-ios-are-here-d00430dee3a7
The camera issue has been fixed in 11.3: iOS 11 its not me its you (tags: iOS11, PWA, Camera)
Ionic 3 PWA (iOS and Android screen shots): https://craftbeer.org.au/