Due to the size and complexity of this deprecation, I am extending the comment period until EOD Friday 17 March, 2025. Please voice your concerns as soon as possible so we can account for them ahead before the plan is accepted!
I have updated the most complex sub-ticket, [DEPR]: Legacy ("V1") Content Libraries · Issue #32457 · openedx/edx-platform · GitHub, which a more detailed migration plan.