Currently the Waterfall Chart in WPM only displays the last Playback.
If errors, or long load times occurred in the past, it would be highly beneficial to go back in time to see what CI caused the issue.
Also report should display the expanded waterfall report as Solarwinds WPM console access should not be required when sending this report off to a web developer/3rd party
I think this is capable now (v 12.2 1/15/2018)
In which table we can see the XHR historical status?