I’ve always felt rather torn between how detection worked in this game versus the games that came after it, but one thing I did really like about it was that it really helped characterize 47.
Obviously, running or doing anything suspicious around guards will compromise you, so instead, you have to sneak around or walk most places. It takes a lot more time, but I like how 47 acts completely inconspicuous as he walks. Even after he just killed one or more people and is in danger of potentially getting caught. He tells himself to remain cool and to look sharp, and he does. As far as anyone else around him is concerned, he’s just a gruff looking but unassuming man just going about his day. He can get caught and killed at any time, but he stands tall and exudes confidence. A lesser hitman would break under the pressure.
It really brings home the idea that he’s someone who’s been trained since birth to be the ultimate assassin and how damn good at his job he is, even after not doing it for a year or so. Add that with his inner turmoil over his existence and his relationship with his mentor Padre, and it all makes for a very fascinating character.