Ivan
Arcane
The AI actually used to be even better but was dumbed down, for example Master difficulty had things like guards getting suspicious if you were in their disguise and carrying a non-standard issue weapon. For some reason IO nerfed it.
That was standard in earlier Hitman games. No steps forward, two steps back as usual.
Piggybacking off this, this is an element I've seen included in some of the harder Escalation variants. I don't think it would apply to specific weapons, but there are definitely ones that require you to carry a weapon that would aggro all NPCs (e.g. the final variant of an escalation I played last night required me to use a barbed wire melee weapon), which had the effect of changing how I infiltrated the locations of my targets). At first I thought, damn why do they make you replay the same setup three times, but I quickly noticed how my play was encouraged to adapt to the new rules. Good stuff, again probably stuff that most folks won't even see if they just stick to the hand-holdy "profressional" setting and call it a day once the "story missions" are done.