The so called "relationship experts" can conjure up percentages and probabilities all they like.. the bottom line ( in my humbled opinion) is, there are NO guarantees that even the most perfectly suited couple will remain married or remain in a long term relationship, just as there are no guarantees that two people who are totally wrong for each other, cannot make a go of it.
Who wants perfect? How boring must that be... ( again only my opinion)
My sister met the perfect man, got engaged, married and divorced within one year. I met a man 28 years ago, totally wrong for me, i married him 6 months later, remained married for 26 years and now decided to go our separate ways. No regrets. How will the experts explain that.
So YES, OP .. Chemistry is EVERYTHING!!! The rest is rather inconsequential..
RE: Relationships and Algorithms
Thanks Molly