Most of what the Accessibility Act wants to tell the masses is aimed at the big corporations and their legal teams. If you run a small business built on WordPress, the more actionable information is available and most of it is good practice.
Things that actually shock people:
Contrasting colors. Most people still use light text on a white background. This fails the contrast ratio and is one of the first things checked.
Forms without proper labels. Contact forms that use placeholder text as a label is a fail and generally bad practice regardless of the law.
Keyboard navigation. Can someone navigate your site without their mouse and access all the links and buttons in an order that makes sense? Most sites fail this.
Captions or transcripts for videos and audio. Most forget to add these to their promotional videos on the homepage.
None of these things requires a total overhaul. It needs an actual accessibility audit. Going page by page to do an audit instead of assuming a modern theme does everything for you, because most don’t. The theme gives you some accessibility. The rest is thoroughly checking to see how accessible your site actually is and not guessing.
A site that functions with no mouse and reads with low contrast is better for everyone, not just the audience the law is targeting.
I think site accessibility improvements that improve site usability for people with disabilities shouldn’t be based on litigation deadlines. A site that works even without the use of a mouse would help everyone, not just those the law is designed to help.