Except players do have to manage the rules. They have to know what spells they can and can't use going in. They learn this from their Player Handbooks, and other resources that are available. It's not like a rules lawyer is limited to a subclass of GM. This isn't just 5e, it's DnD in a nutshell. It's amazing to me that you have access to all these resources, and yet, don't use them to enhance your DnD experience on the PC? I have none of that, and still manage to not fall into the "the only build you need" trap.

One of the main reasons I don't play spellcasters, as a general rule, is because of all the micro-management that goes along with it, including what spells I can and can't use, and when I should and shouldn't use them. When I'm leveling my party, I look at spells that they could take, and if I have scrolls for those, they get them. If it can go to multiples, I pick which would make the most sense for my party configuration. Maybe my Druid, for example, is more combat focused, so I'd pass them Cure scrolls to supplement, instead of passing them to the cleric. Or maybe I have a few, and I spread them out. I've been doing this since BG 1, I'm not sure why it's suddenly so confusing, given that the current meta does need to be addressed. Especially if I had access to a resource that I could put on my second monitor.

However, I don't need a rule book to tell me that a wizard doesn't have Eldritch Blast. Not that I've seen a scroll for that. I also know that Prismatic Orb, despite how it was originally tooled, is a sorc thing here. All I had to do was read the basic information that is provided by the game for that. How it actually functions is questionable, but who can use it is plainly laid out. Yes, it requires that I read the provided information, and retain it, but that's not any different from TT. When there is confusion, resources are pulled up, either through a book, or one of your programs in your case, and it's resolved. But it's amazing to me that you seem to believe that players don't have to know the rules in order to play.