According to the Pathfinder rules on Arcanists
An arcanist must choose and prepare her spells ahead of time by getting 8 hours of sleep and spending 1 hour studying her spellbook. While studying, the arcanist decides what spells to prepare and refreshes her available spell slots for the day.
It makes sense that, if she loses her spell book, she can't change the spells she has currently memorized. But this also implies that she can't also refresh her slots.
Let's assume an Arcanist in the following situation:
- She has lost her primary spellbook, with ALL her spells
- she still has her secondary spellbook, with ONE level-1 spell
- Currently, she has spent half her slots
- After a night of sleep, she study her secondary spellbook
What happens? (i.e.: does she "forget" the spells she still has in memory? in that case, wouldn't it be better to NOT study so she doesn't forget them? Does all her slots get refreshed? Or only the level-1 slots? What's the logic behind your ansswer?)
Wouldn't it be better/simpler to simply says that, like the sorcerer, she regains her slots automatically, but like the wizard, she needs to study to change the spells she has in memory?