I have moved today and it seems like what Dia was aiming to be but all that AI stuff kept getting in the way. Things are developing but this seems the most promising.
If anyone is working towards a transition, I would highly recommend this.

I never truly understood why people are abandoning Arc when it still works as good as ever. I’ve seem some people say it’s because it’s abandonware and only being merely maintained, but I haven’t noticed any change in performance since when I first used it two years ago.

I doubt the BC will actually end up folding it entirely when this is their most acclaimed product. I’d bet that eventually they’ll just realize Dia sucks and go back to full time working on Arc.