New players that dislikes easy solo quests (as the only way to level), will never get into the game and eventually quit. In many other MMOs you can gain exp by doing PvP, random challenges, joining quest groups and running dungeons, for example. That's why I think Big Battles with a scaling option, is a nice initiative. People below cap can enjoy it and use it as a fresh way to gain privileges and exp.
But the biggest reason new players ditch Lotro, is the TP cost. It comes a little bit to early, imo, before people are fully hooked, invested in their characters and prepared to subscribe or grind TP. Now I'm slightly of topic.
I do agree with you, it's important to get new players invested and hooked on the game. Maybe people who played longer get a bit blind (and nostalgic) when it comes to certain bits. Especially regarding the level of difficulty when doing lower level content, gaining exp, gear and so on. They want it to be harder, slower and more loyal to the lore. But going back to that now, would definitely repel a lot of new players. Not because a new player wants to be spoon-feed really, but because the level cap has gone up so much.