It is certainly harder to find an outstanding WR than an outstanding RB.
I think both positions are over valued in some sense.
My philosophy is that if you have a strong OL then you do not need elite RB talent to have an effective running game.
And if you have a strong QB then you do not need elite WR to have an effective passing game.
The Patriots have shown this to be true for 2 decades.
I will concede that it is a lot easier to build a strong Ol than it is to find a great QB so there is that.
But my feelings on this are more about spending draft assets and cap space on the 2 positions than actually having elite talent there. If you can get them cheapish then I am all for it.
I just would not draft either very high or pay them too much unless I had a truly stacked team and that player would be the icing on the cake so to speak.
NE isn't the best example imo, because they had the best TE in NFL history, and they also had Welker or Edelman. So, if you have the most dominant TE to ever play, you don't need great receivers, but that's hard to count on.