DT was never the kind of band to recycle their old ideas for new albums though. I mean, okay, they had some ideas for Metropolis Pt. 2 in 1996, that hey ended up developing into SFAM as we know it, but they've never had old songs that they just threw onto new albums. It's not like they went, "Oh, we're working on Awake, let's throw To Live Forever and Don't Look Past Me" on it. And it wouldn't have worked for FII and ACOS either, because Awake had a whole different kind of sound to it. TLF and DLPM would have stood out like a sore thumb on that album. Same with ACOS and FII. ACOS has an overall much darker, more poetic tone than anything on FII.
Every DT album has something different in terms of the overall sound and mood, so sticking old songs on new albums, those songs would not fit in very well.