What are the MOST important factors in relationships?

Very.

Romance keeps the relationship interesting so no two days are the same. It is a good idea for both couples to remind each other how they feel about the other, how happy they are and how much they appreciate each other.

Relationships with no romance tend to be bland and the couple stuck in the same repetitive cycle daily, resulting in boredom and therefore breakdown of the relationship.

Romance keeps the relationship alive and shows the partner your feelings for them.