Japan loves bringing nostalgic items back. There are even many modern cars here which are designed to look like models from 3 to 4 decades ago.
Dragonball Z Kai is basically a retelling / re-edit for clarity, remastering, bringing to a current audience with current attention-level constraints.
Evangelion is being trotted out again and again, trying to tell the same story repeatedly.
Urusei Yatsura here is just re-doing the series, from what I can see. Maybe it's like DBZ Kai, and a retelling with a purpose.