The 2021 change: impact and response
After July 17, 2021, Amazon will stop supporting the use of HTML tags in the product description on product detail pages. Whenever Amazon rolls out new change I always run What, Who and How analysis. "What is the impact?", "Who will be affected?" and "How To Remedy?"

What is the impact? You either have to delete every single line break, bolded characters and bullets from your product description and have single large block of unreadable text appear on your page or generate Enhanced Brand Content for each listing.
Who will be affected? Every single seller without Enhanced Brand Content (EBC) on their page.
How to remedy? If you can get away with generic EBC for several of your listings, you can use EBC bulk upload. Make sure your backend product description has all information that you have on the page but delete html tags.

Once again, having Brand Registry on Amazon is becoming absolute must have. To me this change signifies yes another step in centering the platform around brands and forcing resellers off Amazon.