They're 5 months apart mate. You can't excuse one for their age when they are both born in the same year.
I don't excuse anyone for their age. In fact I don't think I've mentioned it.
I give Carter leeway for being in his first year of Test Rugby, and having to make up some technical ground as a rookie, as observed in last night's Test, and last week where he also ran a bit high.
I mark Simmons more harshly because he has nearly twice the number of provincial caps, is a Super Rugby premiership player with two extra years as a pro up his sleeve, and is on his way to a half century of Test Caps by the end of the year.
He's technically good at set piece, without doubt, but he can't get his 115kg frame to have impact around the field? Why is that? And why won't you argue the point beyond "he's the Matfield to Carter's Botha". Which is bullshit because Matfield packed loosehead and as a result was more involved in running open spaces.
Simmons packs tighthead, so he's doing more work at set piece, granted. I don't expect his work rate to be higher than anyone except the tighthead prop.
No, I don't like aspects of his play - he has risen markedly in my estimation at scrum time this year and his lineout work is solid on our ball. But anyone who can pack at tight head prop, yet not provide an effective impact around the park, is missing something in their setup, and it needs adjustment.