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Soon, there are still a few things that need to be added before I think that's doable. Plus, I plan on running them both for a while to be sure. I think it won't be long before it's a no brainer.

Soon, hopefully. As @themarkymark said, currently, most of the Hive-Engine features are work in progress (while we are almost finished with Hive related stuff) hopefully, in a couple of weeks, most of the features I wrote above should be finished. Obviously, to make sure everything works fine, we'd like more people to come and test with us and give feedback/recommend features which we can implement so we can have a "one-stop solution for all notification needs" in the future.

I already have, but we already implemented the 2 things I cared about, replies and mentions pretty early on.