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We unfortunately released Astro 6 only a few weeks before Vite 8 / Rolldown came out, which is why we did Astro 7 so soon. But there are very few breaking changes compared to Astro 6. That being said, some of these performance improvements (the Sätteri processor) are available in Astro 6 too.

Cloudflare bought Astro recently, and as it states in docs it previously had cache plugins for 2 companies but not Cloudflare so that may have been a motivation along with the Vite update mentioned

(As an outsider, ) I suspect it's because the Rust rewrite was big enough to bump the main version number.

It was partially that, but mostly the Vite version with the Rolldown bundling etc. We typically always need to do a major whenever Vite releases one because it tends to impact us a lot compared to other frameworks for various reasons.