Equanimity and the Big 5 personality traits

I was thinking today about equanimity and the big 5 personality traits. I've always thought equanimity to be a good thing, perhaps inspired by the lines from Rudyard Kipling's poem:

If you can meet with triumph and disaster
And treat those two imposters just the same;

But it seems to me that equanimity is just the combination of two personality traits: low extraversion (i.e. not getting too excited by good things); and low neuroticism (i.e. not getting too upset by bad things).