Excellent piece from Ethan Marcotte about accessibility on the web. Accessibility is not a problem that a framework can solve for you; it's like the quality of the writing in your copy, not like automatically compressing your images. Expecting software to do the accessibility work for you is like expecting the MS Word grammar checker to make you Jane Austen, and it won't. It's a craft, not a build step.
https://ethanmarcotte.com/wrote/accessibility-is-not-a-feature/