...X is basicallly the only rock band that completely abandons every single one of thier old tunes, what's even worse is that "old tunes" to them means almost every song from their first three albums, but their fourth album from ten years ago, oh that's okay.
X hasn't abandoned every old tune really. Alot of the songs they do play regularly are from Blue Blood. Kurenai, Endless Rain, and X are guarantees for every show. Weekend and Celebration are played quite often, and even Blue Blood and Orgasm were performed once since their reunion. Not to mention an acoustic version of Rose of Pain at the Tokyo Dome a couple of years back, and part of Unfinished was performed at the Yokohama concerts. If i'm correct, thats every song from the Blue Blood album with the exception of Easy Fight Rambling. Oh, and of course XClamation for obvious reasons.
Art of Life has also had several performances since the reunion, even if they split it up into two parts during two nights at the Tokyo Dome performances and in Hong Kong. They even brought the second half during the North American tour.
When it comes to Vanishing Vision and Jealousy, thats a different story. They obviously can't really perform Phantom of Guilt since it was written partly by Taiji, and I also suspect thats why they cease to play Desperate Angel and Voiceless Screaming as well. As for Sadistic Desire, Miscast and Scars, I would say they don't play them out of respect for hide, but they do perform Celebration and Drain occasionally, so i'm not entirely sure why.
Silent Jealousy got performed during their first reunion show at the Tokyo Dome, and was also brought for the North American tour, and they're was an orchestral version of Say Anything playing over the speakers while seating people during the North American tour. Love Replica even got played during both nights of the Yokohama gigs.
On the Dahlia album, some of the songs are performed regularly, like Rusty Nail and Drain. The title track, Dahlia has only had one play since their reunion. I'm not sure how often they've played Forever Love, Crucify My Love, Longing, or Tears, but I don't think they've have very much regular play in the reunion.
And then of course they have new songs to perform for the promotion of their new album. So its completely wrong to say "completely abandons every single one of their old tunes...almost every song from their first three albums". You can say that for Jealousy and Vanishing Vision, but they've played almost every song from Blue Blood, and they don't exclusively play songs from Dahlia. In fact, they only perform like half the songs from that album now. Their set lists today include songs from Blue Blood, Art of Life, Dahlia, and new songs. On occasion, Silent Jealousy too. They only album they leave in the dust is Vanishing Vision.
Playing songs from Vanishing Vision and more from Jealousy would be awesome, don't get me wrong. But saying they completely abandoned every song from their first three albums and that they only concentrate on the fourth album and newer stuff is just completely false.