Because Aikido is specifically built for self defense and not very adaptable to "competition". Its roots are in self defense and remain there; you will never see Aikido in MMA (save for maybe a few techniques) or in other competitions or demonstrations because many of the techniques do great damage (finger breaks and other small join manipulation locks, head stomps etc.) and they aren't geared towards winning "points".
You have to remember, when Maeda taught Gastao Gracie's sons (Helio, Carlos), he was teaching them self-defense, not Sport Judo. Much like the WTF has completely **** up Tae Kwon Do (bringing about more interest in Judo or Hapkido), and fracturing of Karate into hundreds of bickering sub-disciplines (save for Kyokushin and maybe Shotokan), Sport Judo has wrecked the image of Judo and jujutsu. Judo has an association with throws and takedown because of Judo being a sport (and a big one, in the Olympics). Judo as a self defense art (same as Gracie JJ) has no real need for takedowns; if you are defending yourself, there are very few times when you need to proactively work for a takedown. That's why the Gracies emphasized the guard position so strongly; it's one a defensive person will naturally find himself in. Thus, if you look at old Judo, you will see lots of the same things in Aikido and jujutsu - the small circle techniques, the small joint locks, lots of very painful, non-comopetition usable blows, etc.
However, as BJJ found itself being used in competition and MMA evolved away from the UFC1 days where there were no weight classes, time limits, and very few rules (to simulate a real self-defense situations) Gracie JJ had to adapt. You see the sons of Carlo's' side of the family (Renzo, Rolls, and especially Ralph) are more aggressive and sport oriented, cross training in other specialties like traditional Judo, Wrestling, Sambo and even Boxing. The Helio side (Royce, Rickson to a degree and Royler) concentrated on self-defense. That is why you don't see Royce dominating like he used to - he'd lose decision fights too much because they don't focus on competition.
Regardless, that is where a lot of the takedown empahsis in Judo comes from - not that it's innate in Judo, but Sport Judo needs it because competition rewards agression and defense whereas self-defense only should proactively pursue takedowns in very certain scenarios. Many Jiu Jitsu academies now incorporate cross-training techniques, especially from Freestyle and Greco-Roman wrestling because of the strong throws and takedowns.
_________________ "It's real, grew up in trife life, the times of white lines The hype vice, murderous nighttimes and knife fights invite crimes" - Nasir Jones
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