As for me:
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As of this year, I no longer need to consider reading these three, having recently finished Finnegans Wake as my ‘big read’ this year. Proust was last year and War and Peace the year before.
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Non fiction - probably fewer titles, and correspondingly less actually retained.
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Unread books - well my physical shelves are still around 50% unread YET, but I have read a couple thus year that have been on those shelves for over a decade. I am reading more than I add to them these days.
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Loans. Nope. I learned that lesson a very long time back. I don’t know anyone who does lend books these days. Give them, yes, but not expecting them back.
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Audiobooks - it is vary rare that I actually fall asleep, I can say that.
I can listen to non-fiction when driving, although I tend to prefer podcasts. I get little or nothing from fiction when driving though. I can either focus on one or the other. Not both.
I will listen to fiction when washing up, cleaning or for an hour or so in bed before turning off to sleep. Those work OK for me.
Either way, though, long-term retention of detail is never as high from audio ad from the page for me.