Where Shrek 3 and 4 fail is not being as smart in repurposing fairy tales, and essentially the same scene in the first two movies shows us what Shrek 5 needs to get people on board from the get-go.

Shrek specifically dealt with tons of stress due to the introduction of the kids, which was tackled within Shrek 3 in the infamous baby Shrek scene, and a more heavy-handed part within Shrek 4 ...