ES are just samples usually used for tests (reviews) under NDA, before the product launch. They do not have anything more (or special) than a retail version (not even a better TIM ). In time, newer batches from retail proved to be better than ES, in most of the cases. So no reason to ban ES. The only advantage of ES is that the owner can post scores before the people that wait for retail to be available.
As some may receive trays of ES to bin, the same way others receive trays of retail to bin. What is the difference?