With Haiku I like that I can use the computer without having to resort to dark mode like the other operating systems. The other systems are just too bright, while Haiku interface is warm and on-point.
I get that... I didn't like it in BeOS either... It just feels off, the more time spent on more recent alternatives (Windows, Mac, Linux+Cosmic/Gnome/Kde...). Similarly, trying to use OS/2's desktop also feels more and more alien as the years pass.
I mean, I get trying something different and/or sticking to a legacy, but there's also being usable to today's users.
I get the joke, but Haiku could indeed have its year because it's the only one of these OSs that has Firefox running. Do you need anything else? (ok, some hardware support would be nice, I guess)