honestly it's true that the base of the deep dungeon 2.0 is the same than the first one, i regret the lack of different objective per floor... even if i was pleased to see in the big room dummy exit, i wish they had added it in the normal floor too.
the area for 40-80 have a lot of different room, with different shape and such (even if it's always square room)
but what did suprise me, in the good sense is the monster, a lot of them passed 50 are simply extremely dangerous.... i'm not sure to see this be completed by a solo player before long, mostly because some of this monster have ability with really short CD, like the tiger from 71+ that have a giant cleave froze (if you are frozen he will come to insta kill you) and an attack that force you to look away that froze you too, and naturally you are killed if you are frozen...
or monster that put vulnerability up to at least 9 making no tank able to survive multiple aggro, but at the same time, most of the traps are luring traps...

that my two grips with this deep dungeon, first passed a level most of the traps turn into luring traps, and some pack of monster are simply instant death, like the naga from 61-65 that have a giant AoE that hit for more of 25000 damage... if you have naga already and get another from a luring traps it's often means death.... luring traps below 50 is a bother, passed this level is can be a run killer.... and every room can be with a luring traps. because a lot of the monster from this range become mini boss with AoE and mechanic that can simply kill you instantly.
my second grip was already here in the palace of the dead.... the lack of potion for clean pacification, we can clean silence, allowing caster to remain active, but if you are a melee you are simply screwed over.... they need to add a potion for dispell pacification debuff... is not fair not normal to have a large part of the group be screwed if they get the traps that silence and pacificate. worst, in solo run it's instant death.... because monster often need to be exterminate fast....

another thing, that most QoL, i did notice that some music come back really really really often like gubal one and honestly, is one of the music i like the less, it will be nice to allows us to customize the playlist of the music in deep dungeon, mostly by selecting the one we don't want to have.... because one more time, passed a certain range 3 floor can be long and have the music you like the less can be really tiring.