Does ontology matter? In a positivist or purely descriptive mode one can get by without feeling the weight (or the unbearable lightness) of Being. One might insist that Being is just another attribute like any other but consider that due to the ubiquity and importance of this particular attribute, or it's negation, existential quantifiers were introduced into first-order logic. I suppose we don't really get ontological unless we pause to reflect upon this and the strict positivist will shun such reflection as a rule.
It is in the aesthetic or purely subjective mode that we encounter being. In this mode we can reflect upon being and then allow our reflection to give way to the immediacy of being. I see no harm in speaking of Being but how do we speak of it? Heidegger began with ontology and ended with poetry.
Finally, in a normative or evaluative mode one is faced with the question of whether Being or Existence is good or bad. Or, as the original post basically asks "Does it matter?" and "Does it inform you about anything important?"