What really sets Haiku (and the preceding BeOS) apart is that it's built for the express purpose of being a desktop operating system. As good as desktop Linux has gotten it still suffers from servers being the chief use case for Linux-based OSes, seen in quirks such as how poorly it handles running out of memory (not as big of a deal in the server world, particularly in the container era; just tweak your setup and reboot your containers). It's not bogged down with corporate IT needs either.
The last time we got an OS that was as purely desktop-end-user-oriented with no competing influences was Classic Mac OS, which had serious technical issues.
The last time we got an OS that was as purely desktop-end-user-oriented with no competing influences was Classic Mac OS, which had serious technical issues.