Legion's better than Shadowlands, but torches and pitchforks out at people's leisure, not much more so, mostly benefitting from being complete and the expansion's content release cadence. In terms of overall impact, Legion and BFA made something like Shadowlands inevitable in as much as all mystery of the setting had been eliminated and the biggest, most built-up bad permanently benched. Something like the First Ones would have to be inevitably introduced and Chronicle eventually retconned even more than the immediate change of the Titans being alive and imprisoned dead, because short of Elune adnd the Void Lords there were no higher instances left and the setting was solved.