Considering a Robot Design's Center of Gravity
The robot shown above is called Stack. It is a build designed from the V5 Competition Super Kit to compete in the 2019-2020 VEX Robotics Competition game Tower Takeover.
Notice where Stack's battery and brain are positioned. Notice that its manipulators are motored and can be lowered and raised as needed.
In order to design a competition-ready robot, the robot's design needs to be a stable one. That requires the team to consider where the robot's center of gravity is at all times. Raising a manipulator above a specific height should not risk having the robot tip - even at high speeds.