RPGMemes

Yeah, I think the somatic and verbal components were supposed to give away casters (making the sorcerer's Subtle Spell incredibly valuable socially), but it seems like a lot of DMs ignore or minimize it. But yeah, things like a simple persistent Detect Magic field, especially in critical areas, would make perfect sense. In a high magic setting, every vendor having a trinket that grants them Detect Magic continuously wouldn't be out of the question.