Its a 2 part problem. People complained about the "member has withdrawn" spam that Tanks would do continuously join and exit the que until they find an "In Progress" room.
So SE eleviated this problem by spreading out the rewards throughout the dungeon in order to discourage these tanks from doing so.
If they where to put all of the Myth/Soldiery tomes at the end of the Dungeon this will cause even more issues of Tanks not queuing up. Which is imo a bigger problem alltogether which SE have acknowledged. The demand for tanks is very high and i think they made the right decision in spreading out the tomes to avoid this.
So its a pick your poison situation in essence. I think SE would prefer to encourage more tanks to run dungeons rather than punish them for running in the first place (but exiting with penalty).
Until they figure out a better way to avoid these issues i think its "working as intended".
