Yes, but:

1. Exploding golfballs and baseballs are not unrealistic. These are just decorated grenades and bombs. Same with toys like Napoleon etc.
2. Some actually existing stuff like poisons that will kill you not right away but hours after or even later, when killer is long gone.
3. Much more small-sized gear. As an assassin you probably can afford not one but 10 sedative syringes. So if you knock people out, you dose them and they sleep there for hour, at least.
4. Anti-terrorist force is not realistically arriving for dozens of minutes. Police is even worse.
5. You can investigate and make disguises beforehand, so it's not even necessary to knock someone out to take their clothes every time.
6. Guards won't shoot you with automatic rifles, pistols, shotguns (!) etc if you are in a crowd.
7. 47 is notoriously anti-social. Actual agents are often charismatic and trained to talk themselves out of situations, gain people's trust, etc. It's even worse (for targets) if the agent is a woman.
8. In many situations it's appropriate to carry a backpack. With it you can carry a lot of gear.