Why are there 2 clients now? There doesn't seem to be that much of a difference between the 2 and you can just not use the features in the full version.

Edit: I found this post from Calyx: https://www.reddit.com/r/CalyxOS/comments/169toc1/calyxos_fdroid/ It seems to be a way for them to push changes like seamless updates without requiring bringing up the entire F-Droid codebase. Seemless updates is in the full client now, so I don't know what else they will be testing with it, but it seems cool regardless.