First off, it's "hydrothermal missile" and second, it's nothing more than a 15-18k hit at predictable times (in a4s, does almost nothing in normal). If that's a complex mechanic to you, I have no idea what you consider an "easy" mechanic.

Gordias Savage only had a few "hard" mechanics anyway; digititis, savage protean wave, 5-way lasers in a4s...it was all dps checks that made it bad for most. Midas normal has more complex mechanics lol, and that's easy content