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Which part of building a robot turned out to be much harder than expected: mechanical design, motor control, sensor accuracy, power management, or system integration?

A robotics enthusiast posted on r/robotics to gather experience: robot design looks simple on paper, but building one in practice throws up a pile of unexpected problems. Getting a robot to move is one thing, but making it run stably, adapt to real environments, and repeat the same task without errors is a completely different challenge. The poster wants to know which part is the most troublesome: mechanical design, motor control, sensor accuracy, power management, software, or coordination among subsystems, especially problems that seemed minor at first but ultimately required major redesign.

Part of the event: Robotics enthusiast seeks experiences with difficult aspects of building robots

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