I do understand that itās not possible or even practical that all chord changes be implemented into the practice / training area.
But I do think that If a song is selected as a possible piece to use āEnd of the lineā in Grade 1, then I think it reasonable that chord changes for the songs that are listed should be entered into the official practice of that grade. ! More so early on than later as a players skill progresses.
At 3:22 in this vid theres a quick A - G change , but no OMC in grade one. As I was just looking to see which songs I may try in the future, I was watching the Vidsā¦
Thinking to myself, I need to add that 
lol.
R.H