One thing we need to do, is to have good expectations. Not all arts have the same expectation. Testing our arts is great. The problem is applying one arts expectations to another art and then judging usefulness based on the outcome. We start with Aikido vs MMA, in an MMA style test. Thats like taking an MMA fighter and putting him in a boxing match, under boxing rules with boxing expectations. That didn't work out so well for McGregor. (well, except for his pay check) Should we then conclude that MMA is useless because McGregor got stopped in a boxing match? Its the same as putting a judo guy in a kickboxing match. Has not turned out well for Ronda Rousy. Are we to conclude that Judo is useless because she was knocked out in a kickboxing match. (technically it was MMA, but there was very little Judo involved)
The point is that Judo is great for throwing, choking, and grappling. Not so great at punching and kicking. BJJ is great on the ground, not so much at punching, kicking or getting people to the ground. Boxing is really good for punching... not much else though. Kickboxing is great for kicking and punching, but throwing, pinning and arm baring, no so much.
Aikido is interesting, in that many people have the wrong expectation of it. Even many who practice or teach, have the wrong expectation of it. Its not about arm bar throws, wrist throws or really any finishing moves. Aikido is about blending, and taking the other guys balance through blending with him. The instant he touches you, you are in the process of taking his balance by blending with him. The parts about the guy falling down, flying through the air or tapping, are not the point. Yes, he does that to protect himself. But more importantly, he does that to learn the blending... the main point of the art. If you can blend, and take the guys balance there are any number of martial attacks to use, at the point. Some look like aikido, some look like boxing, some like karate or judo or really whatever. The finish is not what aikido is about, it is the blending and entrance. The reason they have the finishes that they do, is that those more fully demonstrate and teach the principles of aikido... not because they are martially effective.
The BJJ guy in the first video, talked about how he took the principles of aikido and applied them in BJJ. He even thought BJJ guys should learn the blending ideas. He got it. There are lots of pieces to being a complete martial artist. Throwing, grappling, pinning, ckoking, punching, kicking, trapping... Different arts focus on the different pieces in different ways. Whether an art is successful and useful should be based on whether that art can contribute its principles to the practitioners. Aikido gave the BJJ guy the principles of blending and off balancing, which he was successfully able to apply in BJJ and other arts. That is the success of Aikido. It is the same for Judo. If studying Judo can make you better at throwing and choking... it is useful. As martial artists, we need to choose what is of most worth for each of us to study. It may be different for each of us. It may change over time. But I would not say Judo is useless and must change, since it can't produce a good boxer.