As I have mentioned already, there aren't any problems with switching between portrait or landscape with any of the 12 mobile devices (of varying size, age & quality) within our household here in deep dark remote Java.
I quite agree. Even here in my home in even darker Spain all the mobile devices display it flawlessly. If it wasn't for SD's Device view which alerts me to the users of Iphone X/XS and all devices that have a width below 800px and a height above 800px.
I guess it really is a non issue.
Astronomy site: http://www.astronomy.artinso.com
Musical events: http://www.orphelion-ensemble.com
ED V4, SD V5