You are right about the Help!/ RS remixes, and we have the same issue in the UK remasters (even the original 87 CDs). That's one of the blunders in the box, I agree. As for Y&T, it includes all the unique mono mixes, and the unique stereo mixes of Day Tripper/WCWIO. The missing unique mixes are the stereo Dr. Robert and I'm Only Sleeping. Apparently, AYBCS stereo mix was made specially for the US, but it's identical to the UK one. Since the original album had duophonics for the three Revolver tracks, it's possible they just applied the box approach (replace duophonics with the real stereo versions) without realising later editions had unique mixes.