I'm not arguing that PivotTables are now useless, because they still solve certain problems very well. However, after seeing how fluid, responsive, and adaptable GROUPBY and PIVOTBY can be, I've found ...
Cue the Terminator soundtrack; Foundation's Phantom is itching for deployment.
Warren Buffett's snowball metaphor explains how small, consistent efforts compound into extraordinary results over time in investing and in life.