In fast fashion you're shipping a knock-off of the $8000 designer swimsuit seen in a Paris catwalk show at the start of July, a preview of your $150 version was shown in a TikTok video that blew up on Friday and your customers will be wearing them on the beach next weekend. By August that product is old news, you do not want that $150 product available for $5 in a discount store or your consumers might rebel - so you want to burn it instead and the EU says no, that's a perfectly good swimsuit, sell it to somebody who needs a swimsuit. Or give it away.
If "fast fashion" no longer makes economic sense now, too bad, I guess you won't do it any more. The EU's citizens do not want you to destroy the planet they live on just to get more money. We made money up. Stop being crazy.