Not necessarily. For example, good design on a staircase doesn't mean that everyone ever can use it, and not every situation can involve alternatives. Accessibility is always relative and is not a binary state. As another example, not every video can be replaced by its transcript. Thinking in binaries leads to rejecting better-but-not-perfect solutions, such as not rebuilding something to be better for most people because it won't be better (or more accessible) for all people.