Yeah, I'd thought about that. It's fairly easy to make sure an item meant for one character gets to that player. Make it a specific quest reward for something they did, given to them by an NPC they're close with, a contact, mentor, etc, or if it's a weapon the rest of the group isn't built around or using, it goes to them. Same with armor. If the other PCs don't use that armor but the intended recipient does, it will generally go to them. Not guaranteed, of course. General found magic items are where you more easily get into trouble.