Amethyst seems good to me -- but I think Castella-fy-san already uses that & not satisfied.
Maybe satellite.earth ? It sometimes gets the replies in wrong order but threading structure is good
Amethyst is not bad, but could be better. I'll give satellite.earth a try...
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I used satellite.earth a lot before it shifted to more community-focus.
I love that when a thread indentation gets too deep it redirects to a separate page for deeper replies + I like the aesthetics of Satellite
Amethyst is functionally very good but aesthetics not so much