So, that's interesting. Depending on the specific wording you use on your search, some results say The 2020 Ford Edge did not have a drain plug in the PTU, and other results say the PTU drain plugs were installed in so=me vehicles starting in 2015.
Either way, as you stated, " Specifically - not ONE of these products should have ever rolled off the assembly line without a drain and fill plug on a gear box. " I whole-heartedly agree with.
If anyone expects a manufacturer to listen to them about a product improvement, they will hit a brick wall. No one can even suggest their designers screwed up.