Is there a simple, or even not-so-simple, way to report bugs to Apple? Or is this reserved for only those who register as developers? I find IOS 13 buggy enough that I’m fed up with Homekit and Siri. I’m sure I’m not the only one running into these issues, but it would make me feel better to know I’m contributing.
For iOS 13 or iPadOS 13, see if there’s a Feedback app in your apps. If there’s not, and for MacOS if that’s at all relevant, I find the Feedback link just by searching the web for the product name (iOS), “Apple” and “Feedback”.
Feedback app is only in beta versions of iOS.
You can do a chat with their support center. You’ll want to go to apple.com and find the support page.