Is that a perception or a fact ?
If that was the case then there would be results were we have been run down or rolled over in the last 20 mins.
Which game is a perfect example of us losing and having an unused back on the bench that cost us the match ? Is there one ?
We've lost 6
Sharks on the bell.
Tigers on the bell.
Cowboys by a cricket score.
Roosters in a tight match.
Dogs by a cricket score.
Bunnies by a cricket score.
That's not necessarily going to be the case. A player being buggered causing failures in play doesn't have to be in the 70th-80th minutes. It would all depend on the possession flow of the game as well as when each played gets replaced.
For example, if we keep Junior out there for 35 minutes in the first half and he is buggered from minutes 25-35 causing the other defenders to need to compress to cover for him and the opposition scores 2 tries on our right edge, that wouldn't be shown in your example
Or, Lane is bludging to get his breath back from minute 55-65 because we had to do a ton of defending, leaking in a few tries in the process, but we had all the ball for the last 20 and still managed to win. Does that make it all OK?
I think the pace of todays game makes 17 players a necessity. Sure you can get by with 16, but some of their output for a period of the game would be so low that a bench player being on for a few more minutes would give more, and let those players have more of a break providing higher output for the time they are on