WayOfTheFourElements
Hero
I mean, my first thought would be "why"? What specifically, is the problem with the scenario you describe? That's literally how wizards operate, and always have operated in all editions of D&D that I've played.
I mean, it's unlikely you have multiple Wizards in the same party. Even if you, it's probably two Wizards, and it's hard to see why that would present a problem, especially given all Wizards copy from the spellbooks of others.
In one of my games, I have 16 players. 6 of them are wizards. If they wanted, they could have a huge selection of spells, but instead all the players want to keep their secrets locked away. One player did manage to steal another player's spell book, but he can't actually prepare any of those spells or else his rival might realize what happened.
Good times.