And a rainy Sunday at that (at least where I am)

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I wish JA had given us the dialog of Lizzy conquering her father's incredulity. He goes from trying to talk her out of it to,
“If this be the case, he deserves you. I could not have parted with you, my Lizzy, to any one less worthy." Quite the endorsement from Mr. Bennet
We aren’t told that they live “happily ever after”. The details we are given (like Lizzy persuading Darcy to seek reconciliation with his aunt) seem to bear out what Lizzy thought earlier:
“It was an union that must have been to the advantage of both; by her ease and liveliness, his mind might have been softened, his manners improved…” This isn’t about an abrupt or total change.
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But behavior-wise they were acres apart and the ridiculous class rules of the period extended that even further.
Lizzy proves at Rosings that she can hold her own in Darcy’s circle. She’s not intimated by his aunt but is always polite to her. She can talk with his cousin of music, books and travel. Her manners are not “those of the fashionable world” but her easy playfulness is a good balance for Darcy who doesn’t converse easily with strangers. In a social situation she would be good at starting conversations, catching people’s tone of conversation and taking an interest in their concerns. And then once the conversation moves on to issues of more substance, Darcy, who has more information and knowledge of the world can talk more.
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Darcy probably had some of Lady Catherine's attitudes as regards to high living with servants catching dust motes before they landed on his riding boots and ordering hailstones not to make a noise on his conservatory roof. .
Not according to Mrs. Reynolds.
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I know Jane Austen's approach ws that love conqueres all
I disagree. I don’t see this as a book where love conquers all. Among other things it seems to me to show how spouses can bring out the worst or the best in each other or fall somewhere in between. The Bennet’s bring out the worst in each other, Charlotte has a foolish husband but manages to keep him happy and make the best of it, Jane and Bingley are two very nice people who will make each other happy but there can be disadvantages to both of them being to amiable as Mr. Bennet points out, Darcy and Lizzy each have something the other is lacking.
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Lizzie allowed he own first impression to become extreme prejudices on the basis of hasty judgments and Wickham's lies.
Yes and she has learned from her mistake. She's not likely to repeat this error. In fact Lizzy expects to benefit from Darcy’s judgment.