The best things are almost always plain and simple. When something is good but in a plain and simple way it is referred to as jimi (地味) in Japanese. Martial artists naturally tend to shy away from things that are too ostentatious. This is because humility is a quality that all martial artists strive for. Something that has jimi is something taht is subdued with almost a plain sense to it.
When we look at the techniques, some may have a flashy quality but those aren't usually the most effective. The most effective are the ones that are usually the most simplest.
People are that way too. Look around at the people in our lives. I am sure that most of us will see that the people whom we regard the highest are the people who are just "working class" people who have a kind of simple and subdued nature to them. We all have that one friend who is either pompous or overly dramatizes things - those are usually the people who are the most complicated.
As we look at the great martial arts masters of old, we see just normal people like you and me. The difference is not in how flashy they are but that they simply put in the work to get good which led us to think of them as great.
Today, the martial arts is, on a certain level, completely different. People tend to laud those with the loudest voices or showiest techniques. This is not budo. In Budo, jimi is simply putting in the work. We put in the work to get good - it's that plain and simple.