Hussar
Legend
Oh, of course. And that's been my point. No DM in the world would ever allow a player to do that. Zero chance. And it's 100% reasonable too. I certainly wouldn't let a player bring in a new spell sight unseen. Of course not.You are quite correct on this, but I would consider it common courtesy for the player to discuss the spells they'd like to include within the game considering it could affect world-building. It could help resolve certain questions before they arose in game - material components for instance etc.
I view this very much in the same way, when our table decided that the Eldritch Knight (after investigating the write-up of that class) would likely have a spellbook which allowed him to swap out spells and how long that would take. We needed to understand how the class would work in our world despite the 5e PHB being thin on the ground with regards to those details.
But, that's my point. We wouldn't dream of letting a player do this, but, the OP expects the players to be perfectly fine with the DM bringing in five HUNDRED spells into the game, sight unseen and then refuses to allow the players to see the spells before they are used in the game.
You do see where my problem with this is, right?