I believe the whole "Putting the park back in theme park" goal is noble, in theory. The spaces that have been built within Celestial Park are beautiful and begging to be utilized.
It's an unfortunate fact however, that as average temperatures keep rising and record heats keep being set, that the kind's of parks that existed back 50-100 years ago; the exact kind that Epic is built to pay homage to; are not sustainable. Especially not in Central Florida. These beautiful spaces are empty. The few that are used are mostly utilized because of their shade structures. Unfortunately, most don't provide enough.
It may not get much hype or attention here, but the Astronomica Splash Pad is one of the best elements of the park. A gigantic play-water feature that gives countless little ones a place to run around and enjoy themselves that doesn't exist anywhere outside of Berk, as well as keeping guests of any age cool if they choose. The fountain shows throughout the day offer a nice misting if you walk by them at the right times too, which is nice!
This area thrives at night. All of the heat and sun-related issues are gone, and the lighting package is truly incredible. It's a great decision to have Celestial close later than everything else. Perhaps it's ironic that the Helios Grand Hotel looks it's absolute best when the sun goes away. A breathtaking, monarchic feature that perfectly sets the identity of the entire park.
I stand by my original consensus. As it currently exists, and especially without any meaningful original entertainment offerings, Celestial Park offers guests the experience of adding 10 minutes of walking across bright, unshaded concrete every time they want to try to ride something in a different land, for the majority of your Epic Universe day. A larger-than-life, beautiful, grueling, mandatory expanse.