The WAI-ARIA Authoring Practices are still in a working draft state, they're are a "work in progress" but at the same time the previous version 1.0 clearly states:

Work on this document has been discontinued and it should not be referenced or used as a basis for implementation. Updated guidance is now available in a new version of WAI-ARIA Authoring Practices.

So version 1.1 is the one to take into consideration. The document recommends a pattern for breadcrumbs, see: https://www.w3.org/TR/wai-aria-practices/#breadcrumb

• Breadcrumb trail is contained within a navigation landmark region.
• The landmark region is labelled via aria-label or aria-labelledby.
• The link to the current page has aria-current set to page. If the element representing the current page is not a link, aria-current is optional.

Breadcrumb design pattern example:
https://www.w3.org/TR/wai-aria-practices/examples/breadcrumb/index.html

This could be a nice small improvements for the breadcrumb and seems to me there are no cons from a SEO perspective.