I originally posted this into the thread about people stealth spirit bonding in Syrcus Tower but it may need to be its own thread to get developer attention.
The way item level is calculated in this game is wrong and allowing people very, very undergeared for the encounters able to enter the party and screw everyone else over.
I'm so tired of wiping constantly on daily Primal DF trials like Titan HM or King Moogle because noob level 50s were able to enter the queue despite wearing primarily level 45 Artifact Armour. In most cases they don't even have a GC lv50 weapon either. DPS checks are impossible if your party ends up with a couple of these folks, which they tend to.
I was in a Crystal Tower run where the undergeared healers were being one-shot during unavoidable AoE like the foot stomps during Archeron / Phlegethon.
I also see people in the Expert DF all the time who aren't geared for the encounter manage to get in because they bought like one i90 accessory item, like that's all they need. The rest of their gear will be pre-level 50 stuff or maybe i60 at best.
The progression for a new lv50 should be that they run Main Scenario and High Level DFs until they have at least all i70 items in every slot.
They should not be able to enter the queue for Expert, HM Primals or CT until they have at least i70 in every slot.
I also think some dungeons like Haukke Manor HM are not identical difficulty level as, say, Amdapor Keep. You should probably re-examine whether all those dungeons belong in the same DF. I don't think they do.
And telling me "just kick those people" isn't a valid solution, they will be stuck in your party for 15 minutes causing everyone else to wipe when they shouldn't have been able to enter the duty to begin with. And then you have to sit and wait for god knows how long until someone else is added to the duty to replace them.
And what is worse is that the difficulty level of Dungeons doesn't even match the item level of the gear dropped in them. Main Scenario dungeons should have loot chests to gain Darklight, and High level dungeons should be dropping the new i80 greens that are dropping in Expert.
You can't even tank the Expert dungeons like Hullbreaker and Stone Vigil HM unless you already have i80 gear; this gear progression makes absolutely no sense at all.
PS: If someone's item level drops below the min. required for the encounter the game should popup and tell them they need to put their real gear back on in one minute or be instant ejected. Don't force players to police your bad game design for you. We didn't design the spirit bonding system, you did so please police it yourself using game design such as auto-kicking players out of a Duty if their items drop below a certain threshold -- and penalize them for it, too. Don't let them queue for 30 minutes as a penalty for wasting every other player's time.