Suppose the person were taking seizure meds? or ADHD meds? Would the situation change then? Are you going to track down the reason for every antibiotic on the slim chance it was prescribed because of some horrible disease that no Ben/Bas Yisroel should have? Suppose the person has bad genes and is taking high blood pressure meds, cholesterol meds, or diabetes meds? Suppose the person is a Type I diabetic or has the BRCA gene?
Maybe the shidduch crisis that has been so popularized is because we have certain people who are waiting for everything to line up to their satisfaction buoyed by people telling them that they have all the advantages and can afford to wait; perhaps those others who ‘act’ more desperate are more down-to-earth and know that Mr./Ms. Perfect won’t come because HaShem gave us an imperfect situation for the express purpose of testing us and having us grow?
Maybe the increased divorce rate is because people think they found the perfect one and discover that they aren’t? Barring situations in which all would agree are untenable, when faced with a minor problem do these people throw in the towel or rely on their maturity to work through it?
Every person has their bashert but whether they miss them (yes, you can miss your bashert) because of their own preconceptions is up to them.