Have you actually even attempted H-LK25? The mechanics were quite difficult, and quite different in every phase of the fight from its normal mode. And congratulations, you figured out numbers are what determine much of a boss's difficulty.
Really, everything you say just makes me believe you didn't even touch heroic content. You didn't even understand that raid gating had guilds so geared up by the time you could actually fight LK, you obviously weren't at the forefront of progression.