I used to think it was all about how good you two fit together in my "younger" years. I think there is a point there when talking about boyfriend/girlfriend material, especially short term. Though I think it's different when when talking about marriage/LTR.

I think devotion might be more important for keeping the relationship going. You can be compatible as people but without the willpower to push through certain hardships/not do certain things I don't think a relationship can hold out for long.

I do think having both is clearly better than either individually but that's not what the post was about, so if I'm wrong, why?