I guess they were important. Just not to the extent they are now. It's especially important to have a good running game with a young QB.
I worded the title poorly. My bad.
No it's a good topic as the role of RBs has morphed over time and I think you are correctly noting a bit of a shift in the league.
It's always been a bit of a copy cat league and a lot of RB success also depends on the tools a team has - so not every team will be the same even though they tend to follow the trends.
But back in the day you would have a lead RB that was the lead cog in the offense, out there nearly every snap and catching an occasional pass - some RBs more adept than others.
Then we saw a shift to what effectively became an RB by committee - a big brute RB for short yardage, small quick RB for end routes, a pass catcher for those situations, a blocking RB for other special situations all often taking a place on a roster... and with the wear and tear of an NFL season that wasn't bad for depth.
Often very effective but for me, also took up a lot of roster space and telegraphed the play by the players on the field.
I think we're in more of a hybrid time now where guys that can excel in the short/brute game but can also be quick enough to get around Ds and better yet, catch passes, are what teams want and need. I think the desire IS to get down to two 1A and 1B backs - and while I really like Stevenson as a pass catcher AND as a very good blocker, we just don't have the short yardage big brute RB on the roster. Henderson is FAR too small for that - and I think Stevenson is close to the size but seems to lack strength and ball security at times.
I think those specialist years had RBs really under valued - and even today, I think the only reason RBs get picked in the 1st round these days is in the hope they'll find another Saquon Barkley (who himself is really only a difference maker on a championship caliber team IMO)
So definately MORE valued and important today than in the RB by committee years - it's now like a semi-committee era now and just comes down to the talents of an RB who one hopes can do 2 out of 4 of the core tasks for an RB.
Another worthwhile topic is the long awaited return of an FB role in the NFL, which would be another full circle evolution in the game.
Good topic