Honestly, your answer seems so bizarre given how much ability a user has with tools like Good Lock to minutely customize phone options, and how some options even have disclaimer upon disclaimer about the caveats of enabling some options.
I agree with NewAge, it should be an option somewhere, and if not an option in Advanced Features or Labs(understandable), at least enable the ability in the back end to check orientation to allow Good Lock extensions to be able to access that option.
I also don't tend to take well to developers making decisions for me based on other user's tendencies to be forgetful or unaware, that's 90% of the reason I got rid of iOS. If that was really the case you could hook a suggestion into the "Optimize" report in "Battery and Device Care," and suggest to turn this option off.
In addition, including an option to add an on screen button or shortcut on the AOD to manually check orientation once, not automatically, could also be a solution. This could also be hooked into Bixby to allow a single orientation check when say plugging in a charger or double tapping the screen.
And one more common sense solution for you: You could have the phone check orientation ONCE upon activation of the AOD. So if I turn off my screen in landscape mode, the AOD stays in landscape mode.
For as much power Samsung and Android gives users in other areas of minute phone customization, it just seems bizarre to me to see an argument against giving users options for something as simple and common sense as this.
