Kenjutsu and iaido are just generic terms like karate and jujutsu. There are several different styles of kenjutsu and iaido. Kendo did evolve from combative practice but is pretty much just a sport now. If you want to get technical we could say iaido and kenjutsu are only sport as well since there is no telling how long it's been since there was an actual sword fight. Sword arts of any kind are still very valuable to any martial artist since weapons training will help improve your empty had skills and vise versa.