Consider the magnificent habitual be in AAVE.
It's not a tense, it's a grammatical *aspect*. If you've ever studied a romance language, you learned words like perfective vs. imperfective, preterite, etc.
Aspect indicates how long a verb is verbing.
Aspects are intimately connected to tenses, and a lot of languages started out with distinct, explicit aspect versus tense constructions that ended up merging over time to become timey-wimey verb stuff.
I took a class where the prof talked about the historical importance of old dictionaries and how US dictionaries used to include AAVE as a dialect, but at a certain point they stopped doing so. No memory of when, sorry.