Well in Obduction the “logs” were explicitly public and every one’s existence was justified by the goals of the people who left them there. They were totally integrated just like everything else in the game. This is a Cyan speciality.
To the extent that immersive sims are adventure games with action mechanics (which isn’t really a complete definition) they succeed in how well they manage the friction between uncovering mysteries and the regular possibility of failure. Adventure games highly limit or outright prevent failure, but if you can die like every 10 seconds to a zombie or whatever there’s a lot less ability to emphasize the careful unfolding of a secret plot
As for savescumming, I think that’s a problem almost entirely wrapped up in stealth failure. Stealth in general is a difficult and unsolved mechanic in games, immersive sim or otherwise.