Level syncing people down to the dungeons optimal rank is worse than actual level capping the dungeon. It's playing backwards. People should be suggesting syncing the mob rank up instead of syncing the player rank down.

It's the whole surplus arguement all over again and how it's presented, except in this instance you're asking for surplus instead of bonus SP. Dungeons SHOULD be easier the higher rank you are. That's how MMO levelling systems should work. A R50 should NOT have the same difficulty completing a R30 dungeon as a R30. People rank up their characters so they they're stronger and if you rank up and you're still the same strength in the dungeon then you haven't progressed your character at all. Where's the sense of progression if you're always going to be held back to the strength of a R30?

Give us a dungeon difficulty option the same as leves. People can then see their character progression as they move up the stars without the dungeon being any easier, unless of course they choose to leave it on the lower star difficulty.

Honestly, having new players do the dungeon at R30 and finding it challenging is good. Having them hit R31 and thinking they're stronger now and it should be slightly easier only to find they're being gimped back down a rank is very demoralizing. It's a very bad precedent to set.