The folks who oppose restoring balance through level sync do not see this as a problem, and never will. It doesn't matter that ignoring the mechanics in the dungeon and boss fights is not running the dungeon as intended. It doesn't matter what you, I or anyone else (especially new players) think. Seemingly all that matters to that group of people is speed grinding the content into the dirt because it's more convenient for them to do so. I don't for a moment believe the statements that amount to little more than wounded pride, complaining about their new shiny gear being made irrelevant by ilvl sync. That's not the issue, the issue is the time taken. It seems to come down to a matter of convenience and speed for those players vs game balance and playing as intended for everyone else, along with a major dose of helping newer, low level players learn and enjoy the game.
In my opinion, we're looking at a straight conflict between the vested self interest of a group of high level players at end-game who want to grind everything out as quickly as possible, and the more altruistic interests of players who want to play the content as it was intended to be played, and help other players learn and enjoy the game. It reminds me of the differences between hunters who hunt in a large mob and melt S rank marks in seconds vs those who hunt in just a full party of 8, and take down S rank marks as intended. The hunt mob wants the seals as quickly as possible and doesn't give a damn about the actual hunt, as long as they get credit and receive their reward. It's all about speed and the rewards.
I feel like that is actually the greatest conflict in this and most other MMORPGs. The conflict between players who must have everything as fast as possible, and will grind things out as quickly as they can as if it is a race to the finish; and players who want to play the game, and literally take the longer term view of the game, and so do not rush to cap everything in days. This conflict of philosophy is something I just don't think will go away any time soon, and especially on this forum, the representation of the different philosophies seems heavily biased towards the speed run mentality.
In other discussions people have talked about end-game/progression oriented players vs social oriented players, sometimes it devolves to hardcore vs casual and other lebels and name calling, which misses the point IMHO.
Overgearing content in the absence of a balancing ilvl sync effectivelty breaks the game. That's a fundamental issue, and one group has no problem with that, but others do.