Ask three teams for revenue and you will often get three answers. Not because anyone is wrong, but because each computed it their own way, from their own copy of the data.
Model once, use everywhere
A semantic layer defines each metric a single time. Every dashboard, report and export reads that definition, so the numbers agree by construction, not by luck.
Trust is a pipeline property
Tested transforms, monitored freshness, and lineage you can follow. When people trust the data, they use it, and decisions get faster.
The fix for conflicting numbers is not more dashboards. It is one definition.