Nobody is ever going to confuse Bong Joon-Ho with an Alfred Hitchcock or a Sidney Lumet - direct, precise filmmakers. Joon-Ho's films veer wildly in tone. OKJA is no different than SNOWPIERCER, MOTHER, THE HOST etc. in that regard. But, no matter the apparent looseness of his filmmaking style, Joon-Ho's movies work on a deeper emotional level. And, so does his current work.
It's a Girl and her Pig tale meets Whistleblowing on evil corporate scientists - Charlotte's Web meets The Insider. Don't let the idyllic early scenes of the Mija and Okja the pig in South Korea fool you - this movie gets pretty dark before it's over (Parental warning: the movie is unrated, but it would be an R). Tilda Swinton has a dual role as twin sisters who run the evil food-processing corporation Mirando which has developed Super Pigs like Okja. The Mirando scenes are played very broadly which can be off-putting at first compared to the more naturalistic farm scenes. There's also a militant animal rights group (the ALF) lead by Paul Dano - and, those scenes often play as wacko as the Mirando ones.
All three story strands come together when Okja and Mija come to NYC and New Jersey for a Super-Pig convention, that, naturally, will be crashed by the ALF. As I noted earlier, the movie gets pretty grisly and dark towards the climax, but a strand of black satire and a touch of humanity makes it bearable - and brings the theme into focus.
OKJA (and Joon-Ho's work overall) is not for everybody. His methods border on the undisciplined, but, for me, they burrow into the subconscious like few other movie-makers working right now.

It's a damn shame that Netflix is dumping OKJA into only a handful of theaters. The $50M production with plentiful CGI deserves to be seen on the big screen. But, like the Mirando corporation, Netflix has their own corporate agenda.