I like serrations because they cut better certain things. Even on partially serrated edges serrations help initiate cuts.
I like serrations on daggers because they already have a full plain edge, so it can benefit from having a full length serrated one too.
Also daggers are for what they are.... not the best camp knife, but it can be a good military knife.
Serrations are also best for cutting meat... if you know what I mean...
And INFI is probably the best steel for serrations.
Not to mention, some serrations can be sharpened normally
I understand a serrated dagger does not have that symmetry a collector would want out of a dagger, but if we're talking about a TG dagger, we're talking of a beefy heavy use dagger, something I would want as a general utility knife, not just as a dust collector or purely stabbing tool (like the hawkeye dagger)