Agree about 100% though intimacy is still critical to a healthy marriage... both sexual and non-sexual... physical and emotional. Without it you drift apart and lose sight of why you are together in the first place. Intimacy(physical) keeps the bond strong, w/o you are just room mates with a tax deduction.
I think when people get stuck in the trance desire and use it as a measuring stick of pleasure and love, they proceed to screw up the natural flow of intimacy because it's just not exciting enough...like it used to be. It's what some call being shallow - an adult character without depth.
Then they get stuck and their relationship (and the individual involved) does not mature naturally. They don't move on to learning unconditional love, forgiveness, mercy, sharing, etc. and derail into resistance and conflict and eventually violence and/or abandonment. If they fail to learn, they will do it again and again.
Also, sexual abuse in childhood (mental and/or physical) can mess the natural development of deep, mature relationships and individuals and block intimacy and the other aspects of love. This is why I despise the left interrupting the normal development of children by inserting their adult sex agenda, feminazism and bent materialistic attitudes into their “education” and entertainment. Some of the children are going to grow up totally and unnaturally twisted and won't be able to have healthy or natural relationships. That is a grave offense against children.
About men not being that interested in commitment; those guys are socialized not to appreciate their existence and meaning beyond sex and material. Same with women who are like that. Some males (and some females) are socialized to believe that non-material (non-sexual) aspects of love are of a female only or a lie.
There is great vulnerability required in a deep relationship. Some men (and women) have been taught to avoid that for self protection but in time, they will experience it with their wife (or husband) in a natural relationship (if they are fortunate). Mature intimacy comes out of those experiences of vulnerability.