You seem to forget that you also need extremely costly Scroll/Alchemy kits to brew anything higher lvl and rogue-like at its hardest in the beginning, when your budget is at its tightest.Grenadier loses Brew Potions, which is a pretty significant loss. Pretty sure spending a month in Port turning cheap ingredients into valuable pots and scrolls will be a key strategy to get around the low rests.
DLC got reverse difficulty curve anyway and only becomes easier after first big boss at lvl 11/MR 3. There is a ton of basic +1-2 loot on trash mobs in the second chapter already so money stop being an issue.
Well some Aeon could have problems performance-wise, but high end Mythics like Angel/Lich/Trickster go into full faceroll really fast.