@Gargron I do hope that one of the improvements is that when one adds an image, the alt-text box automatically and immediately opens with the cursor in the box, ready to enter the alt text. This will finesse three problems:
1. not knowing about alt text
2. knowing about alt text but not knowing how to enter it
3. knowing how to enter it but forgetting in the moment
Making it the natural default removes the structural bias against entering it.
The problem is that the current design is biased against alt-text entry in that it puts barriers in the way. By having the cursor placed in the alt-text entry box as soon as the image is posted, the new default is neutral: the user can choose to enter alt-text or not. With the old implementation, often the choice is not made because the interface hides the opportunity for the choice.