Harn was (relatively) quite a bit more popular when URW began its development. It's hard to remember for some people, but roleplaying back in the 80's/early 90's was MUCH more rules-heavy than today's games. After all... there wasn't anything else to do, with no internet and few distractions besides reading. If you were a socially-awkward misfit (like myself), it wasn't too crazy to spend hours poring over complex and byzantine systems, memorizing rules, and finally playing with other like-minded individuals. Sessions might last for 8 hours or more, and if a ruleset required extra time, that was sometimes considered a good thing! Especially if it added more realism. Anyway, those systems were honestly far more suited to a computer program... and luckily, we have games like URW now as a result!