Thank you - yes, I've read several articles that point out the burn-in problem with OLED displays. From those articles and my experience with the AMOLED displays on my Samsung Galaxy S8 and S8+, I understand that burn-in can be mitigated, if not eliminated, with a dimmed display and/or a moving image. Apple buys their OLED panels from Samsung which are made to Apple's specification - for better or worse will be determined after the iPhone X has been 'in the wild' for a month or two - as it's Apple specs, I'm leaning to the better side.
What I was hoping for is someone who could point me in the direction of a "Night Stand" type app that uses a combination of dimmer display and moving image to minimize or eliminate burn-in and make the iPhone X, in fact, a great solution for use as an always on night clock (or at least as good a solution as my Galaxy S8+ currently is). It is possible, I guess, that iOS developers have not had to deal with burn-in so have yet to developed such an app.