Unfortunately, I just wouldn't install a native app for that. My browser is plenty performant to handle it, and I want to be able to call it up wherever I am -- on my home computer, work computer, friend's computer, backup work laptop, whatever -- without having to bother to install something. (And some companies don't let you install software.) Also I'd want to hide stories I've already read and want that to be synced, which necessitates a server anyways.
I'm genuinely curious what benefit a native app has here, why that direction was taken? I can honestly only see drawbacks. (I can understand an app on mobile, just not on desktop.)
The UI can also be designed with the user's best interest in mind, as an alternative to the egagement-driven dark UX patterns that have started becoming the status quo on the web in just a few years.
I use a CLI for Reddit specifically for this reason - I would definitely be potential user for something like Yack. Opening links from the app in an external browser is trivial. Now that you mention it, it'd be a good idea to make it work in the other direction as well. Surely it wouldn't be too tricky to make a browser extension for this?
What if there is this new community site? You need to develop something again in the unified browser to make it work.