You have, they're just more subtle since MMA is as striking oriented as the two particular fighters in the cage allow.
Randori is the term for practice, aka getting tossed on your head over and over until you learn how to stop being a scrub. It hurts. It's not for everyone. But Kano Jigoro knew that hard practice could not be done without.
Newaza is the term for ground techniques aka the entirety of BJJ's arsenal. The armbar, the gi chokes, the rear naked choke, you can thank judo for all of it. It was taken out of competition with an extremely short time limit on the ground because it made the sport more spectator friendly. But old school judo had/has no time limits.
Clips? Shit man. I don't even know where to start. How about the entire careers of Fedor? Ronda Rousey? You might have heard of Masahiko Kimura? The judo god that broke Grandmaster Helio's arm? Ever see Khabib Nurmagomedov reap someone like they were a sack of potatoes? The Dong, Dong Hyun Kim? Sexyama? It could take days doing that.