While I think it is possible the feature may arrive in a future update, these are all concerns that come from releasing two similar phones within a few months of one another. (android.gadgethacks.com)
It's a collector's haven; a lover's respite (at least until co-op arrives in the future). (playstationlifestyle.net)
Presumably, if such an option is being added to Developer Options, then that means it is in testing and may arrive in a future version of Android such as version 8.1. (xda-developers.com)