When you buy in bulk at Costco, you are acquiring a product optimized for shelf-life and structural integrity during high-heat baking. While this prevents chips from completely disappearing into the dough, it can occasionally lead to a waxy mouthfeel or uneven distribution of chocolate in the final product if not handled correctly.
Understanding the chemistry of these semi-sweet morsels allows you to manipulate your recipe to ensure the richness matches the volume. It is not about replacing the ingredient, but rather adjusting the environment in which the chocolate operates to achieve a professional finish.