Query Plan Analyzer - is it reliable?

Sisense's R&D team analyzed this issue and clarified that model statistics is not updated after every build.
There is a configuration that defines how long collected statistics are considered valid.
Please go to Admin tab - Configuration - -5 clicks on Sisense logo - Base Configuration - base.modelStatistics.freshHoursInterval.value.
Value in this field is the amount of hours the model statistics is valid. In case you need model statistics to be updated after every build, set this value to 0.

I guess the only downside to updating statistics after every build is that it makes the build take a little longer. I guess it usually only matters if you've been modifying the underlying data or views in a way that might change whether a member of a dimension has many or one rows.