Please do NOT remove lvl sync for low lvl dungeons in future updates as what they are going to do with Chinese server in their upcoming 2.4, PLEASE!
P.S. for your info, Chinese server is going to remove lvl sync (as well as ilvl sync if it exists) in dungeons for their 2.4 launching on April 1st (which seems not being a joke). Players won't receive exp anymore for the whole dungeon (except roulette bonus) if the biggest lvl difference among party members is larger than 11, though they will get gil and loots as usual. This is to say, if 3 new players under lvl38 happen to get a lvl50 player randomed into their party, they won't receive any exp during the dungeon. And official there is even asking low lvl players to use DF instead if they really want exp through dungeons...
Since one of key marketing managers of the Chinese version recently met Yoshida-P (and guess he got the permission of this modification), this makes me really worry about the future for JP, NA and EU servers.