> Lastly, Wpengine never fully disabled post revisions, they just limited it to 2-3.

Not quite. https://wpengine.com/support/platform-settings/#Post_Revisio...

"Every WP Engine site has WordPress revisions disabled by default... Revisions can only be enabled by contacting Support... Support can help you enable 3 revisions for your posts to start. Revisions should not exceed 5."