Something I appreciate about JP/// is the world building it did. We got to see more of Sorna, abandoned facilities not seen in TLW, a different tribe of Velociraptors, the Spinosaurus, two new herbivores, the aviary and the Pteranodons. A lot of cool and interesting things that complemented the franchise.
I think not having the T-Rex and Spino fight would've been a better direction to go, and the T-Rex NOT being killed would've absolutely been a better direction to go. If it were up to me, I would've simply had the T-Rex appear in maybe one good scene on its own and let it take a backseat to the Spino for the rest of the movie. It still would've allowed the Spino to be the new big bad without being so polarizing and controversial.
That aside, I have warmed up to JP/// over the years and enjoy it as a basic adventure movie set in the Jurassic universe. I do often wonder though what could've been had they had a proper story locked in before they started filming.