Why never any new potion recipes?

Artificers ought to be able to make Potions of Mordrem Slaying. I mean, come on, we have Outlaw slaying, Dredge slaying, Sons of Svanir slaying, Ogre slaying, Elemental Slaying, Krait slaying, Grawl slaying, but no potions against the monsters covering six entire maps? The only recipes that seem to have been added for HoT are expensive (linseed oil) boosts to the dropped atunement potions for increased map bonuses (because we all need even more barbed thorns.)

And there are apparently no new PoF potions at all.

Food has been a more popular boost item because the boosts cover all combat, not just specific enemies, but potion-making shouldn't be totally forgotten, either. Why shouldn't there be Potions of Strength, Potions of Frailty, Potions of Speed, etc. Maybe even some new ascended cosmetic potions that give you a temporary aura or special effect. There aren't even any new tonics Artificers can make.

Why completely abandon one aspect of artificer crafting?

Agreed. They are helpful in dungeons, so the selection could be improved upon. I'm sure someone will say the game is easy enough that they arent needed but oh well. I personally would like to see more of them.