As it is, early raids throughout the game such as labyrinth of the ancients or alexander gordias, etc. are so trivialized by the non-existent item level sync that the content essentially just becomes whacking on a prettied up striking dummy for 10 minutes until you can get your roulette bonus for the day. When's the last time anyone has ever seen the mechanics in crystal tower? Apart from one or two instant kill mechanics, I'd bet that the answer would be "not in 5 years or so". The extra stats from being upwards of 80-100 item levels above the original item level the content was designed for just ruin it all. extra health making attacks barely a threat, extra DPS skipping mechanics entirely, etc. It all just builds up to a feeling of "why even play this?"
It could easily be fixed. Just tighten the ilvl sync from a level cap's max ilvl, down to somewhere like 20-40 ilvls above the original minimum. Enough that it'd be faster/easier at launch, but not enough to turn the content into a complete snooze. I know a lot of people want to just get their daily circus tower run for EXP or relics and get out, but is that really a healthy state for the game? Content that you have to run over and over should at least have some level of thought or intrigue needed. I know that all blurs together when you repeat it for the 10th time, but still; It's a problem for new players seeing the content for the first time, as well. Having Labyrinth of the Ancients be a player's first view of 24-man content doesn't make for a good impression...
I don't know... this problem is so prevalent throughout the game, with content becoming trivial not too long after it comes out. It's a normal raid, sure, but later normal-level content can get fun enough even for just being normal when mechanics are actually somewhat threatening. For the new player experience, it really just makes the game a matter of "get to current content faster so I can actually have a nice time" rather than being able to enjoy the content that's already there. Yeah, there's extremes and savages, but being able to enjoy the content fed to you through the story and roulettes would be nice, too.