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Robotics enthusiast seeks experiences with difficult aspects of building robots

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A robotics enthusiast posted on Reddit's r/robotics, soliciting input on which parts of building a robot turned out to be much harder than expected. The poster said robot design looks simple on paper, but actually building one throws up a pile of unexpected problems: getting a robot to move is one thing, while getting it to run stably, adapt to real environments, and repeat the same task without errors is another. The poster wants to know which part is most troublesome—mechanical design, motor control, sensor accuracy, power management, software, or coordination among subsystems—especially problems that initially seemed minor but ultimately required major redesign. The post gives no conclusion.