Lots of different parts and lots of different tools are needed to build high-quality robots.
If something is frustrating or difficult to make, or is otherwise turning out badly, then either you are using the wrong tool or you are using it incorrectly. In fact, some jobs are literally impossible without the right instrument. Using the correct tools in the correct manner makes almost any job fast and easy.
The same principle applies to parts. There are an infinite number of materials that you can employ to build a robot or provide a particular feature. It's important to choose materials that will make your robot more robust, adaptable, and less expensive.
Often, the greatest barrier is not knowing that a tool ...