Again I’d have to dispute that. If we had 15 Slippers we’d have won more games. Way more.
Would you say Cian Healy is a snapshot of the problems Ireland are having? They’ve had almost identical careers and I’d say he’s a shade less of a player than Slipper. Yet they’re ranked number 2.
I agree LHP could be a bit more competitive for Australia but other than South Africa recently every team has lack of depth somewhere at some time. That’s just a snapshot of life.
You would be in a small minority that ranks Slipper ahead of Healy. Slipper might be your preference but Healy has had the far better career:
Leinster
4× European Rugby Champions Cup: 2009, 2011, 2012 2018
7× United Rugby Championship: 2008, 2013, 2014, 2018, 2019, 2020, 2021
1× European Challenge Cup: 2013
Ireland
5× Six Nations Championship: 2014, 2015, 2018, 2023, 2024
2× Grand Slam: 2018, 2023
3× Triple Crown: 2018, 2022, 2023
Healy has been considered the better prop over the course of their careers as well. Go look at any 'Top Loose Head Prop' lists or articles over the last 10 years and see if Slipper is ever mentioned. It's more likely to see Sio's name than Slipper's.
Having a lack of depth in a position is normal but when that lack of depth means the average player in the spot plays more Tests than anyone else in the history of your team - you are in trouble.