The key is to see what kind of robot, some robots must use servo motors, some robots do not need.
A motor is just one component of a robot. Let's say that the software of a robot is more important than the hardware.
But in today's society, everyone is working in cooperation and division of labor. Some people engage in software cowhide, and some people engage in motors. Everyone is a strong team.
In summary, whether it is a problem or not is another problem. As long as you are interested in this stuff, then you can just let it go. Do n’t think too much about it.