No it doesn't. Read @hawkeyefan's posts. Or mine. We're not talking about either of the things you describe here.
I don't get this at all. DL is more interesting because Tanis's former lover is now his enemy and a dragon hierarch (or whatever they're called - it's been a few decades). LotR is driven by the fact that Gandalf has backstory with Saruman, Aragorn (via his descent from Isildur) with Sauron, Frodo (via his relationship to Bilbo) with Gollum, etc.
Evocative fiction tends to relate to the character, not just to cyphers chasing after McGuffins.
I couldnt disagree more. DL was actively damaged by that bit of unlikely and unbelievable cheese and would have been much better without it.
And LoTR is driven by people not wanting a tyranical force of evil to win and enslave/murder all the good guys. The only backstory that matters in the slightest is Aragorns, and thats exactly the kind of "this guys a special snowflake and your all his sidekicks" adventure thats fine in a novel but a problem in a group activity. No one wants to be the sidekick to your fated hero.