Im telling you, i am creating a optimized windows 10 iso, meaning i disable and remove AS MUCH stuff as possible and i left every single service on either Disabled, Manual, Automatic, or Remove, and left the AppReadiness blank and i tested the other way around, i left all the others blank and i set AppReadiness to Remove, and start didnt work, i tried setting it to Disabled, didnt work, I even tried Manual or Automatic and it still doesnt work, the only way it works is leaving it blank.
Keep in mind, i am using Windows 10 v1809 (you said long ago, so im assuming you used another version other than 1809), so maybe this version has some more dependencies towards AppReadiness, also, if i disable or "sc delete" Appreadiness AFTER installing the iso, not in Winreducer, start menu still works