NFL offenses don’t remain static philosophically.
What was effective and popular a decade or two ago isn’t likely to be what’s effective and popular in today’s league. The constant morphing of philosophy to counter what defenses are doing in regards to scheme and personnel is one of the reasons why being an informed football fan is so important: you can’t just say “this is how an offense should run” and spit out the same answer for 30 years straight without being very wrong at some point.
With the Shanahan and McVay offensive systems heavily utilized throughout the league and with hot offensive coordinators like Ben Johnson getting head coaching interviews (and then, apparently turning down offers), it would be prudent to once again find out “what’s working” in the NFL.