Where I've worked BI wasn't ever used by decision makers. It's used to make dashboards that are part of a sales pitch to clients, because clients love pretty pictures and "science".
BI, like every other tool doesn't exist in a vacuum. It has to be present in an environment that has peopeople that know how to help themselves use the self-service attributes (i.e not Boomers), it also has to occur in a culture where KPIs and metrics are understood, and used in day-to-day discussions of the business, there should also be a training component to deploying your BI solution too.
Without these aspects being present, your BI solution will devolve into either a sales prop with pretty colors, or it will become a web version of Excel.