Hi Jan,
In short, I would like to build KPIs from Facts.
As a report builder wanting to display an aggregation compared with its previous period, I can either use the pre-built KPIs with a metric or the above headline and do the same to achieve my goal.
However as a Analyze user browsing through the data catalog for a fact that I would like to aggregate; the data sets are "polluted" with metrics that are only used for the KPI with the compare to previous period.
So, I believe as a report builder I would like to build less of these metrics, which could be done if we could build KPIs on Facts.
And so, I was wondering what the product team had to say about this idea.