Hello @cannandev! The bump down of the Card Headings from h1 to h2 works for the category view. However, when viewing a single card, the card title should be an h1 and the category heading should become a non-heading element since it is more of a breadcrumb in this instance. Also, when the single card view uses the "Validate" or "Discover" text as an h1, it becomes an usability/accessibility issue since discrete views shouldn't have the exact same h1 heading.
Another issue I ran into while working on this was that the updates to the heading levels in the HTML snippets only addresses the left panel of the cards while the right side is all handled in the MD files.
Lastly, this may just be semantics, the "Phase" and "Timing" headings are not really headings but more metadata. As such, I think this should be changed to a description list which is used to markup metadata.
Just some thoughts I had while working on this.

Thanks for the context @jasnakai. That information about the category being a breadcrumb was key to understanding the issue. I'm concerned about adding macros and logic in the markdown files and the impact that will have for future content managers that have no Liquid/HTML experience. We should take a step back and revisit these templates. This way we can keep all logic in the templates, including section headers, and leave markdown for simple text.

I'm going to close this issue and copy your comment into the original #447 ticket. Thanks!