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In my experience breaking layering leads to interesting optimizations. Another Cloudflare feature is using JPEG start-of-scan boundaries to guide HTTP/2 frame multiplexing:

https://blog.cloudflare.com/parallel-streaming-of-progressiv...

It's a total protocol layering violation, but makes images appear on screen much faster.

This doesn't seem to be quite that simple. If I have 10 workers (or 100 or 1000) for the same domain then it has to warm them all. Which maybe it does but that seems inefficient.

For now only the route that uses domain.com.

And given that Cloudflare is a big proponent of encrypted SNI, I wonder how this will play into it :)

Encrypted SNI hides the SNI from an eavesdropper and not from Cloudflare if you are connecting to a Cloudflare-managed zone.