Seems like an interesting effort. A developer is building an alternative Java-based backend to Lemmy’s Rust-based one, with the goal of building in a handful of different features. The dev is looking at using this compatibility to migrate their instance over to the new platform, while allowing the community to use their apps of choice.
Quite the opposite, often it’s a benefit as you don’t end up wasting time and changing code for features where you don’t actually know yet whether your current usage demands or supports them. There’s a lot of genefit in not moving fast and not breaking things. Mostly that, well, you don’t constantly break things.