I Agree, the system looks too much casual.
I really enjoyed the systems of TW1 and TW2, even if they where different, they had more pro's than con's.
In this game, alchemy is s**t, because :
1. A simple diluition refills a bottle? Why are there so many alchemy ingredients? Just to sell them? Earn lots of money is never a problem in this game...
2. It looks ok to me to drink anytime(although I liked TW2 system), but WHY there is no animation at all? You can even pause and drink!
3. the quick slot is limited to 2 potions at time, so you have to press 'I' several times, every combat. Very annoying!
So here's my suggestion (I hope in cdp or modders):
1. After the creation, the next refills require some alchemy ingredients (like herbs), but in a lesser quantity
2 Let the player drink during meditation (increasing duration, decreasing effectiveness and toxicity), or "on the go", with shorter duration, more toxicity and effects adding an animation
3. Add some quick slot.
Notice that similiar suggestion to 1 and 2 where suggested in the posts before.