Models are greatly useful while listing the products by sellers, using
the model numbers help ship orders more easily, many sellers make use of
model numbers to access their product information easily, but this type
of easiness is not available to product option aka product variations.
When user plan an order with few product variations then seller need to
way to access variation information easily, without the variation model
number it is not an easy job. Model can be helpful to maintain inventory
for product option/variations. Model can be repeat for product option
.Models are recording with product option when placing an order.