I am not familiar with modern D and D. But can a fighter pick up a scroll of magic missile and caste it? I thought the whole concept for magic was that Armor interferes with spells? that's why mages can't wear armor? Also, is not magic learned? don't you have to study it and learn it to use it?

Seems to me that is like just anyone picking up an electrical plan house blue print and wiring your house up with it, without any prior training or knowledge? Does D&D 5e allow this?

or is this an attempt to make some classes not needed? we don't need a mage we can just get a scroll sort of thing? We don't need a cleric we can just eat the food, giving players more flexibility on party make up?