Interesting. Not sure I'll try it because I have my setup very refined (although I use awesomewm so it's maybe a little simpler to switch anyway) and I'm long past the age of testing out new distros for fun. Not to familiar with dinit but I've been waiting for s6 to be usable with Alpine for a while now. How do you think it compares?
Do you notice any performance advantages on Chimera?
I haven't used s6 much, so I can't really comment on that, but Chimera tends to boot significantly faster on the same hardware, compared to Alpine with OpenRC, mostly because of dinit's parallel initialization.
As for system performance, mimalloc's effect isn't particularly noticeable in regular use. Or maybe I just don't stress the allocator often enough. There may be more daemons running by default, but they are also activated on demand if you aren't using them, so YMMV on that.
For desktop use, it feels like an early (but already quite usable) version of what a respectable systemd replacement would look like, and I think that's its greatest strength in practice.