I don't care how they do it, but what does it matter if the current one is obsolete due to the addition of a higher level version? If my ability to proc TH (which is a constant excuse for why thf is not more powerful as a DD mind you) is impacted directly by how much TH gear I have equipped, I would like a less crap dagger with TH+ on it. If that comes from some trial on the current version, or through a new higher level dagger it doesn't really matter.

I know some have brought up that dual wielding two TH daggers would be a problem, which is fine. Just make it so TH weapons cannot overlap, similar to how wearing multiple movement speed items does not increase your speed over wearing one.