I'm not convinced that emphasizing RB over TE is an 80s mindset to tell the truth. If you take the top 5 offenses by yards (not the be-all and end-all of metrics, but they actually line up fairly well w/ PPG as well so I think they're a decent reference point) you're looking at KC, Rams, Bucs, Steelers, and New England. The Chiefs with Kelce (a top tier TE for sure) got 103 catches for 1336 yards, which is enormous production from the TE spot, but they still threw to their RBs for around 70 receptions and 700 yards, and that's without Hunt (a premier back in his own right) for 5 games. So for KC you can definitely make the argument that their TE is more important to their offense than RBs I think.
But the Rams rely on Gurley in their passing attack WAY more than their TE. The Bucs have Howard and Brate and they get good production between the two of them, but they're still throwing to Rodgers at a good clip as a receiving back. The Steelers threw at Connor/Samuels more times for more catches and more yards than McDonald, their TE1, although once you add in James' combined production at the TE position it outpaces their RBs. In New England White caught more passes for more yards and more TDs than Gronkowski. If you add in the Saints (a very solid unit offensively), Kamara is far and away more important to their offense than whichever TE they run with in terms of productivity in the pass game.
I'm not sure how often the Bucs or Steelers line up in 2 TE sets, but just going by these teams it seems to me that having TWO capable tight ends can help diversify your pass offense, but I stand by what I said about RBs playing as important if not more important a role than TEs in the best modern NFL offenses.