I've seen some people complain about the fact The Beatles: Rock Band is not exportable, you can't play current RB DLC on it, and it'll only worth with Beatles DLC. Well, here's a few reasons it's good that it is standalone!
tl;dr people can just read the stuff in bold to get my point.
1) If Rock Band 2 (and its DLC) was exportable to The Beatles: Rock Band, that would fracture the community. You would have some people playing on RB2, some playing on TB:RB, and that would kill the whole platform concept that I am convinced HMX still wants to keep.
2) If The Beatles: Rock Band (and its DLC) was exportable to Rock Band 2, it would not support harmonies. The RB2 engine simply is not programmed to do this. Thus it would kill part of the fun of playing these songs.
3) The Beatles: Rock Band will most likely help the RB platform grow. The Beatles will inspire people to pick up TB:RB. That might get people so into it they want to get into the main game. If the main game's DLC was supported in TB:RB, it would not encourage converts and you'd still have that community fracturing like I mentioned in #1.
4) The Beatles: Rock Band is a whole new game, just with Rock Band gameplay. It is meant to give you the whole Beatles experience. It is NOT meant to be traditional sort of Rock Band. That's why you don't have your own characters. That's why you go to famous Beatles-related locations, the dreamscapes, etc.
TB:RB is not meant to be part of the platform. I think part of it might be for licensing reasons (only way HMX could get the songs), part of it for technical limitations, and part of it for that experience HMX wanted to give people.
I understand that some people are disappointed that it is not exportable. If things like The Beatles themselves, the harmonies, the whole experience HMX put into the game... if those don't interest you, then perhaps this game isn't for you.
This game is not meant to be an expansion pack. It is not meant to be Rock Band as we know it.
I'm done now.