I agree to you three's perspectives
To me, humans are not created equally...
Therefore, there can't be a perfect creature... But of course there are "right" partners; "Mr right" for female and "miss right" for male. "right"based on individual taste. But based on "virtues", the "right" might be lacking/lagging.
Searching for "mr/miss right" most eventually leads to the wrong choice.
So like the second perspective stated, I think virtues should instead be searched for.
Even those in "seem perfect" relationships too have their own challenges... They are able to sustain and maintain their togetherness based on the fact that; right from onset, they have individually concluded to learn to "do with" their respective weak points.
So, there would always be "mr/miss right" if mr/miss are in quest of "miss/mr virtuous" and not solely focusing on "right" based on their tastes
I know am inexperienced, due to my little experience about relationships.