How? The sublinks devs started the project just because they didn’t want to work on Lemmy for whatever reason. If they did, they would have worked on Lemmy. It’s either Lemmy AND Sublinks, or Just Lemmy with the same developers.
Having multiple implementations is a good thing, regardless of what language they use. They all implement the same protocol, should be (mostly) compatible, and can learn from (and compete with) each other.
Look at other OSS. There’s so many Linux distributions, Why doesn’t everyone just work on a single one?
Because everyone has a slightly different view on things. This makes the OSS community stronger.
Pretty much - I’m too stupid to write my own mouse drivers for the mouse I use so all the buttons work 😎