It doesn't matter how we can explain it, or how the scenarists describe it. Ner'Zhul using his last percent of energy left to empower his savior, Arthas in better shape because he's not far from the Frozen Throne, or Illidan being Illidan (narcissist, arrogant, know-it-all, and dramaqueen/anti-hero) and he got outmached because he tripped on the snow or whatever. Arthas was meant to be a big villain. Who cares if Illidan transformed, used fel laser beams, summoned fel fire to melt the whole Northrend. The guy who eats demonic energy for breakfast and received his invitation to the club of fel energy lovers by Sargeras himself, lost to a young human with a big sword.
This fight outcome never reflected the power of the fighters. Might as well illustrate that fight with good scenes and animations. And taking a break mid-fight to drop your weapons and going commando to continue the fight looks cool. So yes, it's only a prophetic storytelling thing, because before WoW, the main narration in Warcraft was more important than the individual credibility of few scenes. And the narration needed Arthas to win this fight, and Illidan to engage it so he could fail it, so both could gain some dramatic-fallen-hero fames.
And of course Razorclaw_X, Illidan's power should not be proportionate with his age. Because as you said, he spent the majority of his life in a tiny cell. But before being imprisoned he had quite a lot of fighting experiences. Way way more than Arthas. I'm not an Illidan fanboy, I don't like the character. But power-wise, of course he should outmatch pre-Lich King Arthas.
He was already a really good warrior before he met the Burning Legion. Arthas' fighting experience was about smashing ghouls and murdering villagers.
Why are you using WoW retcons like Sargeras giving powers to Illidan in this context? The Wc3 Manual does not mention anything like that. I just read the manual to confirm that.
The only reason you think Illidan should have won is that you know the WoW lore instead of original RTS lore. It's all Blizzard's fault, not mine or yours.
The only reason you think Illidan should have won is that you know the WoW lore instead of original RTS lore. It's all Blizzard's fault, not mine or yours.