Hi! I recently built a new Git client for iOS that’s designed to make syncing Obsidian vaults simpler. The interface is much more minimal than Working Copy, and it supports the core tasks you’d need: cloning, committing, pushing, and managing folders.
It’s built on libgit2, so for very large repositories, it may run into similar limitations. But for typical vaults, it should work well — either as a standalone syncing tool or in combination with the Obsidian Git plugin.
It’s called Weee: The Git Monster. Check it out if you are interested.