Let them ask questions
As a report author, you start building your reports based on the information needs and business requirements you collected before your project. However, every answer to a question, triggers a new question to come up. In the end you end-up with more questions to answer than you thought about up front. Maybe even with scope creep in agile projects.
However, it is very unlikely that you answer all the business information needs in your dashboard or report within one iteration. So why not give them the ability to exploitative interact with the report and ask questions in a native language to their dataset? Power BI has the ability to ask questions to your data in your native language in just a few clicks.
This is probably one of the most underutilized aspects of Power BI.