I agree with what you're saying, but just as a quick correction: Illumination actually produced about the same number of original, non-IP movies as Pixar during the 2010s, four non-IP movies to Pixar's five (Pixar: Up, Brave, Inside Out, The Good Dinosaur, Coco; Illumination: Despicable Me, Hop, Secret Life of Pets, Sing). It just feels like less because Pixar was producing sequels to multiple movies, whereas Illumination was mostly focused on the Minions franchise.
Good point, although Up was 2009. Disney picked up the slack though with Tangled, Wreck-it-Ralph, Frozen, Big Hero 6, Zootopia and Moana.
If you look at Disney + Pixar vs Illumination + Dreamworks in the 2010s you get:
Disney + Pixar: Tangled, Brave, Wreck-it-Ralph, Frozen, Big Hero 6, Inside Out, The Good Dinosaur, Zootopia, Moana, Coco w/2020s offerings of Onward, Soul, Raya, Luca, Encanto, and Turning Red.
Illumination + Dreamworks: How to Train Your Dragon, Despicable Me, Megamind, Hop, Rise of the Guardians, The Croods, Turbo, Home, Secret Life of Pets, Trolls, Sing, Boss Baby, Captain Underpants, Abominable, with 2020s offerings of The Bad Guys and the untitled Pharrell Williams project.
Irrespective of how many properties each company introduced, Universal would realistically leverage fewer of them for their parks than Disney, simply because the popularity will never be there for Hop, Guardians, Turbo, Home, Captain Underpants, and Abominable, whereas every one of the Disney properties in the 2010s bar The Good Dinosaur has either been turned into an attraction or was rumored to become an attraction.