Yeah as noted above, this ruins dungeoning in WoW rather often.

Before they had an LFG tool it was hard to get into a PUG and not find some max-leveler in there gimping your XP and drops just by being around. Even with their LFG tool now, it will happen once every dozen or so runs (and in WoW dungeons are so fast and easy, that can be once every 2 to 3 hours)...

Anytime an expac has a new race or class and there's a bubble of people leveling alts - it becomes a mess of folks who bring their 'buddy' and ruin it for everyone else.

In guilds... if you're a high level, you will get whispered all day long by new recruits with "can you run me through the Tower of Nooblets?"
- and it gets very taxing trying to tell people NO, and then getting back "wow this guild hates new people"...
- And the worst part of that is, level sync is not an option there either - so you couldn't sync down and help them even if you wanted to...

But now think of those old raids... You hit 60, or 70, or 80, or 85... and want to try out some raid... one max level member comes along and you end up spending the entire experience just watching a machinema of another person play WoW, up close.

GW2 and City of Heroes both had level sync, and it was great. City of Heroes made it an option... so you ended up with the 'Nooblet' crowd and the 'vet' crowd kind of resenting each other still... "stop pestering me for runs" versus "nobody is helpful around here"... but they let people sync up, so it got even worse "if you want to see the max-level taskforce, level up already and stop asking to get carried in"...

GW2 got it right: mandatory sync to the level of the dungeon. End of discussion because there is no discussion. Want to run the level 35? bam, everybody entering is level 35.

FFXIV does the same... and it helps to avoid a LOT of potential drama.

But GW2 does one better: if you go into that level 35 on your 80... you get loot like an 80... so everybody likes to run everything across all the levels. FFXIV should copy that - especially because we have better level syncing here. In GW2 if you go with your 80 to a 35 dungeon, you actually have the ability/power of about a 38... so you somewhat overpower the place... Here, the sync seems to be more precise... no overpowering. Or, maybe I just haven't seen it yet.

But they need to make it worth it loot wise.