I guess you've read that shared post by @Stormgren. Image descriptions are not only good for blind or visually-impaired people, but they're also good to help sighted people understand an image which they wouldn't understand without the description.
"I have no interest in your topic, and don't even read your posts, but you violated this rule that I arbitrarily made up, and I will force you to change even if your actual followers don't even want it."