... I'm a teacher at heart and see one function of the creative enterprise known as 'Art', to leave the reader/viewer/listener not only entertained, but also better armed to cope with the vicissitudes of life. Life is short. Humans are not that complicated. Foolish beliefs, irrational moral precepts, irrelevant customs and conventions, a rigid adherence to ideas about what one can and cannot say to others.... so many things prevent honest discourse. While I agree with your statement - "People with good intentions and flawed behaviors should probably aim to find a partner with a similar number of flaws, and practice patience with them in exchange for patience in return." The serious flaw in that idea is that very, very few people are aware of their own behavioural flaws, partly because it is considered impolite to tell them, and child psychologists insist that every child is an individual masterpiece, not to be constrained by petty conformity.
I suspect the reason so many 'literary' masterpieces revolve around unresolved character flaws is because the writers are unable to come up with an interesting plot. Personal problems are serious and one should never simply say, "Get over it!" but....... and as usual I'm raving.