I actually thought of applying the same quote to Edward and Lucy, thinking of them in the future:

"His temper might perhaps be a little soured by finding, like many others of his sex, that through some unaccountable bias in favour of beauty, he was the husband of a very ignorant, artful and selfish woman -- but she knew that this kind of blunder was too common for any sensible man to be lastingly hurt by it."

Except...Edward is likely to be lastingly hurt by having made a blunder in selecting his marriage partner. It was kind of surprising that Elinor could think this about the Palmers, and then, after realizing that someone about whose welfare she cared deeply had made the 'blunder' of being biased by beauty into a poor choice, the stakes are much higher. She's aware that "The youthful infatuation of nineteen would naturally blind him to everything but her beauty and good-nature."

But after talking to Lucy about their engagement, Elinor is left with "the melancholy persuasion that Edward was not only without affection for the person who was to be his wife, but that he had not even the chance of being tolerably happy in marriage."