Using an overlay to help with repetition can be extremely effective.
It does not preclude you from using adaptation. Sometimes it is just a helpful reminder of key points in a match up (does not need to strictly just show the build order) - you can get creative with it.
Overlay use can be good even in conqueror. Obviously you can’t just turn on the overlay, you need all of the other skills.
An integrated build order function could be great with the Art of War system getting more people to transition into multiplayer. Not sure how high it could be on the priority list though.