There's this constant tension with D&D where it wants to be medieval and it wants to have easily-reproducible magic. Follow the magic through to its logical conclusion and you get essentially modern technology with a mystical/medieval aesthetic, ignore it and you get big blatant plot holes.

For decades, Forgotten Realms tried really had to be this "peasants have their minds blown if they see even a level one Magic-User spell being cast; this is a grounded and gritty setting sort of" pretense in the official materials, but then there's basically a magocracy running most cities (even the fucking Luskan pirates and other "savage frontier" big mean guys!) and maps full of "oh a web spell is on this window at all times" sorts of signs that maybe those peasants should be a lot more familiar with the very special very rare spellcasters that rule over them and make all the important decisions.