This film and Jurassic World had me wondering how such poor scripts could get green lit and have over $100 million put into them. Do studios not have a team of competent screenwriters review scripts before they begin production on such large films?
It doesn't work like that. Studio don't "hire" writers, they buy scripts. In this case Fox went to Devil and Emmerich and asked for a sequel to be written, they went away for 20 years and presented this film. Fox gave them the greenlight based mostly likely on the success of the first film.
Writers sell their scripts to producers who present them to studios to see if they will finance the making of the picture. In these cases the studio may or may not demand script changes which could be either for the better or worse (usually worse). Fox had trust in Devlin and Emmerich and probably gave them creative freedom as the first film made so much for them.
In many instances (often with franchises), they actually do hire people to write the films then choose the best script from them and have rewrites done. Considering this film has 5 credited screenwriters, it actually looks like the Studio did hire additional people to do work on the original script, but what I'm wondering is how such an obviously poor script could have so much money put into it. If the screen writers were actually competent or they had a strong screenwriter as Quality Assurance or something, then the floor for script quality should be higher.
I supose the ridiculus demand from studios these days that all movies, no matter genere or franchise, must have a running time of 2 hourse tops, is partially affecting results in a very negative way.
You do indeed sound like a grumpy old man. There are still hundreds of non-spectacle films being released each year, actually more than there have been in the past.
Also, television in particular is much better made than it used to be.