I think the most disruptive part is the migration to the new LTX format,[0] which I'd imagine is hard to do incrementally.
[0] https://fly.io/blog/litestream-v050-is-here/#the-ltx-file-fo...
[0] https://fly.io/blog/litestream-v050-is-here/#the-ltx-file-fo...
Thanks to mtlynch and everyone else who has submitted bug reports. We're squashing issues and working to get everything stable as quickly as possible.