I currently manage five actively-supported free themes on WordPress.org. Moving forward, I plan to coordinate theme updates on a regular cycle. Updating all of the themes at the same time allows for efficient review and response to WordPress core updates. While WordPress core has shifted to an approach that frequently releases breaking changes, I plan to maintain my collection of themes in a more stable format.
My theme updates will typically occur on an 18-21 month cycle. I may release intermediate theme updates on a one-off basis when I need to add features for a particular site or fix critical issues caused by WordPress core changes. This cycle is intended to reduce efforts to accommodate core changes that become obsolete shortly thereafter. It ensures that updates are more substantial in content. And it falls within the 2-year maximum update sequence allowed by WordPress.org.
I released updates for all five themes between August and October 2020. The themes all support WordPress 5.5 (and likely back at least to 4.7, unofficially). They support the block editor selectively. I support editor styles, color settings, and wide alignments (where appropriate). But there is limited custom block styling, no support for block patterns, and no support for custom fonts, colors, or gradients. I may support similar features once WordPress introduces a stable global styles system. For now, trust that my themes emphasize stability and sustainability.