I wasn't correlating a strong lineout with a weak scrum, just noting that a weak scrum cannot be tolerated at all compared to a weak lineout.
You noted the Stormers/Crusaders game as one where the lineout dominance by the Crusaders won them the game. Well it's actually the complete opposite. Late in the 2nd half the Crusaders had been attacking the Stormers' line for 10 minutes and couldn't break it down, they had all the possession in the world but no points to show for it. With 10 minutes to go, the Stormers finally turned the ball over and had a scrum feed on their 22. The Crusaders were up by 2 and they got a penalty from the scrum to make it a 5 point game. The Stormers then attacked the Crusaders line for the last 5 minutes getting numerous penalties but obviously could not kick them, they had to score a try and couldn't. Had the Crusaders not won a penalty from the scrum, the Stormers may very well have won the game.
I will always argue a competent scrum is more important than a functioning lineout due to penalties. Possession won't score you points, penalties will. RWC Quarter Final with Aus/SA will back this up, their lineout killed us and gave them plenty of possession yet they didn't win penalties from it. If our scrum got demolished like the lineout, we would've lost. The Waratahs won the game with something like 35% possession on the weekend, there was a stats that having the most possession lost you the game more times than not last year. The game is won on the scoreboard and a kick at goal is a definitive scoring opportunity if you have a very good goalkicker.
Rod Kafer said on the weekend that penalties from scrum should not be allowed to be kickable, completely agree.