It's fine to dislike Haiku because it doesn't run on your hardware, but it's pretty ridiculous to assert it isn't an OS because it "can't run on an actual computer". Haiku runs on tons of hardware, including most of the machines I've tried it on, and it probably runs on far more devices than Risc OS ever has/will.
Edit: there's literally a massive thread (https://discuss.haiku-os.org/t/computers-compatible-with-hai...) on the Haiku forums that documents just a small fraction of the hardware Haiku works on.