Tbh i feel fire and nature colors too close. i mean red and yellow aren't the best colors combo to differentiate 2 elements from.
Keep in mind we re-did weapon elemental FX earlier in the year, which also has a 4th variant "energy" (which is just bluglo effectively). Between those 4, we have 3 of which I'd naturally want to color blue (ice, energy, and electric). To help separate the hues and make these chromatically distinct, electric seemed like the only logical choice that could deviate away from blue and go more into amber/yellow.
Now using those 4 as a template, I hope it makes a little more sense why we went away from blue. However I did try to counter it some with the little blue arcs that spawn from the enemy's body. It's not much, but does help some.