Maybe incorrect to you, but I've heard people say that before. The phrase I'm used to hearing is more along the lines of "it's more exciting when there is higher scoring" which really just means "moar points = moar better".
And no, people didn't go RB/RB/RB due to scoring system - they did it because there used to be a lot of bell cows. Go back and look at how many RBs had over 300 carries 15 years ago vs. now. Or 250 carries vs. now. It's crazy. PPR was invented to take away value from RB and add to WR, but the game has shifted and PPR is no longer needed, but you can't take away that toy from the baby. I blame millennials
However, what you said has long been my argument against PPR. It does feel like it increases the player pool, which yes, can help teams with injuries, but you know who else it helps? Bad managers who whiff at a position in the draft. Increasing the player pool without increasing the number of starting spots is essentially a parity mechanism.