Mecha masters didn't have an obvious advantage in this aspect. After becoming a mecha master, one's lifespan didn't increase much. It wasn't much different from the limit of ordinary people. They were all around 150 years old.
These privileged people could extend their lives by decades using biochemical technology, barely reaching 180 years old.
Therefore, the 200-year lifespan limit of a Great Grandmaster among traditional fighters was not very attractive to the privileged class. They all focused their energy on areas such as consciousness transfer in order to obtain eternal life in the field of mecha.
But now, the upper limit of the lifespan of a Celestial had reached 500 years, which was a fatal attraction to the privileged class.
In the absence of a breakthrough in mecha consciousness transfer technology, there would definitely be many privileged classes in the future who would choose to switch to other classes or learn martial arts.