When introducing TTRPGs to people, "rules-light" TTRPGs are less friendly compared to more traditional games since they are more open ended and can more easily confuse players who don't have this experience. On the other hand, D&D 5e is a terrible introduction as well. The are definitely good middle ground options.

OSR is the ideal middle ground in my opinion. Most people think of D&D fantasy when they think of TTRPGs, and most OSR systems have just enough rules to structure that type of game, but without being overloaded with simulations of every single little thing.