Article

Background
Proto-Germanic itself did not possess an article, definite or indefinite, though it did specify definiteness by the weak declension of adjectives. Naturally, this could lead one to apply the weak declension to the determiner sa, giving a "regularized" sān, *sōn, *þan, respectively by gender. For comparison, this is basically what Old Norse did with their definite article -hinn, albeit they used the determiner *hiz, "this", as their starting point.

While this isn't necessary for the (re)construction of Germanic as a language, many modern European languages now possess a definite article, and some could say Germanic was well on its way to developing one, anyway. Therefore, it might be slightly easier to include a definite article as an option for people learning the language.