Mel Choyce-Dwan, the Default Theme Design Lead for WordPress 5.6, kick-started 10 tickets around two months ago that would bring new features to the old default WordPress themes. The proposal is to add unique block patterns, a feature added to WordPress 5.5, to all of the previous 10 Twenty* themes. It is a lofty goal that could breathe some new life into old work from the previous decade.
Currently, only the last four themes are marked for an update by the time WordPress 5.6 lands. Previous themes are on the list to receive their block patterns in a future