F-Droid 2.0 reworking the repository index format is a long-overdue move. The old system relied on repo maintainers manually keeping metadata in sync with the client, and it showed. If the new approach uses a standardized index that the client can validate without trusting the repo server blindly, that alone makes the upgrade worth it for anyone shipping ROMs with F-Droid included. The tradeoff is that repos with custom apps will need to update their index generation pipeline, and some smaller repos just will not bother.