Google defines emotion as "a natural instinctive state of mind deriving from one's circumstances, mood, or relationships with others."
Everyone likes to have good emotions. In fact arguably logical goals have value because they cause good emotions. Why do you want a good career? You will have better emotions. Why do you want a good relationship? You will have better emotions. There are other motivations people have like wanting to leave behind a good legacy and people also consider other people's emotions, but "to have good emotions" is usually a big part of a given person's motivation. This might make it seem wise to base decisions on emotions, but it's not.
"Basing decisions on emotions" essentially means making your decisions in the heat of the moment without considering the overall picture. When you think in terms of "data" that can include considering what would lead to better emotions for yourself and others in the long run.
Maybe a relationship is making you feel so good at the moment but if you stop and think about it you realize that if you got married to that person you would both wind up very unhappy.
Before making a major commitment it's best to stop and think about it than to just act on impulse.
Relationships should be based on emotional decisions and not data. I don't know how data will help someone in a relationship. It will give the individual more insight into the other partner he/she is interested, but its still data. In the end, the relationships should be based on emotional and well being for the other individual.
No, I do not think that relationships should be based on data-based decisions as opposed to emotional decisions, because relationships are not about data. Relationships are not based on a spreadsheet. A person has to feel things towards the other person in order for the relationship to work. Relationships are not fixed numbers.
Dating sites have revolutionized the way couples meet one another, and certainly for the better. Many loves have sprung from these new relationships. However, this does not mean that relationship decisions should be based more on data than on emotional intelligence. Couples worked this way for millennia and there is something to be said for it.
I do not believe relationships should be based on data-based decisions as opposed to emotional decisions. Creating and forming relationships is very important but it is also based in emotions and feelings. We should not remove those feelings from our relationships because they are the very purpose of them. Not everything can be answered with statistics and numbers.