If you know you're going to add accessibility, which ... we have had WCAG since 2005, not knowing that at this point is negligence imho, just make sure you work with frameworks and libraries that won't require overhauling all the things when the PO or management finally get sued into letting devs actually implement it properly. If that kind of functionality takes a backseat to "stunning" and "beaituful" designs that a bunch of people can't use, we take the user out of user interface.