The subject of this thread is misleading (more precisely it is false), as mentioned above.
And serious doubt the OP's claim that he (or she) can "can easily kill any enemy". Unless the OP is power gaming or at a very high level, when the game should be easy (or you will have Oblivion type level scaling).
At around level 40 and lots of help and armor I find some enemies can one shot (or nearly one shot kill) my character on Master. That is not easy. And that is a
fact. It is true that at around level 40, if you build a powerful character, most enemies can be easy (including bears, trolls, many bandits) but boss level characters can still kill in one shot. Fact.
On master enemies like bandit chiefs, briarhearts and deathlords are always a big threat.
If you find those enemies easy on master, without hugely exploiting crafting, how do you deal with them with such ease?
Most likely he doesn't. When he (or she) say's "any enemy" he is probably excluding those. And Giants for that matter.
Unless of course you just hide and fire arrows. But that is not possible if a gang of bosses appear in the wilds.