The reason is because they came out with a new class that can do in excess of 800 point blade barriers?
if he didnt have evasion a team of 6 well trainned and highly skilled undergeared artificers could take him out easily (as long as they all had a umd of 44+ and carried resurection scrolls rather then raise dead)
They wanted to make these quests stupidly challenging .. and to tell you the truth my experience with lord of the blades on lama in a pretty high end party with three healers .. and it was pretty challenging on normal (wiped twice but that was because of a targeting bug even with the targeting bug we almost beat him the second time)