I'min favor of new expansions having spell books in them. Otherwise you can either go buy more books seperately which is about $15 or keep swapping your cards out of the ones you got which is annoying. But then I'm just a fan of spell books in general.
I really don't see why it should be necessary to do that. If you don't have enough binders, keep the rest of your builds in deck form.
Thematically I HATE using the binders during a match. They don't make me feel like a real mage, they make me feel like an apprentice who can't remember even the most basic of their own spells.
When narrating a serious life and death duel between fully trained mages, there is absolutely NO effective way to suspend the readers' disbelief about this.
I mean, how would anyone take it seriously if someone wrote something like this:
The fog had cleared, allowing the Forest Shadow to see that he was only a few inches away from his prey, the nearly dead enemy Forcemaster.
As her impending demise neared, the forcemaster frantically flipped through the pages of her spellbook, desperately trying to find a way to stop the legendary panther from gouging her heart out with its terrifying claws.
"Aha!" she weakly whispered in triumph. She had found just the spell she needed. She quickly enchanted herself with a basic defensive enchantment, Block, just before the cat took a swipe at her.
Any intelligent person who read that would wonder why the cat didn't just attack her while she was reading her spellbook.
It's a shame that Arcane Wonders has made the spellbooks so integral to marketing the game. I think as soon as they have enough money to do so, they should just abandon the whole "reading while fighting for your life" thing, since that's just stupid.