Tend to agree but also think that there are other ways
18th man can be part of the build up, part of the squad until kick off .. The difference between that and say Luc who sat on the bench for 80 one round is pretty minimal - they sit just on the field instead of just off it. Lomax has been travelling reserve or 18th man in pretty much every game - would have done a lot of warm ups in case of a pre game injury .. Plus the two trials including the shield have given him a part taste of things.
If you are going to give a bloke a debut - particulalry an outside back then you really need to give them time on the paddock as well ... He needs to make a kick return or two, make an early tackle run or two and definitely needs to be making a decision in the defensive line. You really cannot do that in 7m esp if a game is already won.
The interchange bench is an interesting one this year.
While I've been critical of the middle rotation in the past, we currently have 4 of the best middle forwards in the game, plus Mann playing an old style lock/ball playing role, and latimore doing a job.
Between JDB and Mann they knock out 80 minutes easily.
Between Ah Mau, Graham, Vaughan and latimore they easily cover the 40 minutes average that we need from them.
So what to do with the extra player? If you add him as a middle who do you take minutes off? LAM and Latimore are the middles playing less minutes, so you would have to think that you take minutes off Graham or Vaughan. Either way, the quality of the player that you replace means that you will be losing something in that position.
If you add him as a second rower, you take away minutes from sims or frizell, who have both been proving that they are legitimate 80 minute players.
So where does the 17th fit? I think it's entirely worthwhile at the moment to give that spot to the young blokes to give them experience, and use them to plug a gap in the event of an injury.
I would guess that if we lose one of Vaughan, De Belin or Graham, the bench will change and we will add a middle (so 3 middles off the bench plus Mann. Maybe Sele and Lawrie), to cover for the loss of a quality long minute middle. Or we add host so that he can play an edge while Tariq and Friz get some time in the middle. Until that happens though, I think we will continue as is.