The tool is a means, not an end
The most important point is this: the dashboard tool is the means to visualize and explore data, not the source of value. Value comes from having well-collected and integrated data, from asking the right questions, and from the decisions that analysis generates. An excellent tool with bad data or without focus is useless; a simple tool with good data and clear objectives delivers a lot. Therefore, before obsessing over the tool, ensure that the foundation (data and questions) is solid.
