How do you handle SEO copy when you have hundreds of similar products?

Using supplier text on e-commerce pages is an easy shortcut early on but search engines eventually start treating all those pages as duplicate content. We saw a huge bump in search traffic after taking customer questions and real reviews to fill out missing details like dimensions and actual use cases.

Writing unique descriptions for every item manually takes forever if your catalog is huge. For those managing big stores what's your system for building helpful product pages without burning weeks on manual writing?