Again, as I've stated before, arguments like these would make more sense if said outdated content we're talking about were actually challenging with level and skill sync and actually required you to play optimally with level-appropriate rotations.
However, such a challenge doesn't even exist since synced veterans' ilvls still end up turning synced content into a brainless steamroll. The only literal difference will be that under the current system, veterans are spamming a few buttons over and over. With my suggestion, they at least get to use whatever skill they want to alleviate even some of the boredom. Would mobs die faster? Perhaps. But let's not fool ourselves here: with the current system, mobs already melt super fast anyways the moment synced veterans enter the fray.
So again, I'll dare point out that the thing that the no-crowd are trying to defend (balance/challenge in outdated content) doesn't even exist in the first place, so what exactly are they arguing for? With or without skill sync, said outdated content are brainless stomps anyways, so again, I say just let the veterans use all of their skills to at least alleviate some of their boredom and at least give them a sense of progression.
And again, no one is calling for the removal of level sync, only skill sync. Hence, I don't understand either why the no-crowd keeps throwing the "Don't do content that requires level sync" phrase. That completely ruins the point.
No, no one's asking for Lv. 80 powerhouses to be thrown into roulettes as is. We already have undersized parties for that. All we're asking for is to at least let us have fun gameplay-wise and allow us to use our full kit even when we are level-synced. Because let's be honest, even if you reach the endgame, most of this game's content will be synced (since most of the time, you'll be doing roulettes for tomes and money or older FATEs for relic stuff), and most of the time we don't even get to enjoy the Lv. 80 kits that we worked hard to attain.
And again, I'll dare to use the community itself to argue against the current system:
If the current skill sync that we have now is truly "healthy" for both the gameplay and the community, then why do most people turn it off via undersized parties when given the chance in Party Finder the moment the situation allows for it? If people truly enjoyed the "challenging" outdated content that we have now, then why do nearly all veterans AND sprouts just bumrush to the finish line instead of taking in the sights and exploring slowly and carefully? If players truly found forced skill sync so "engaging" in old content, then why do so many people play Blue Mage?
I don't know, but based on what I'm personally seeing in the community, I think the game will be far better off if we did away with forced skill sync on level-synced content.