I love how you guys have handled the spell book and embraced allowing the player to prepare a list as needed throughout the day
I'll be honest, knowing the 5e rules I came into the game 100% expecting that I would only be able to change my spells at camp before resting and never even
tried to do anything else. Didn't even know this was possible. Now knowing it's possible, I think that if someone wants to stick to the rules as written, they're still perfectly free to.