Addicted to YA discussion

What are yall's thoughts on annotated books? Do you like the idea of them? Would you do them yourself or purchase an annotated copy from someone else?
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i love annotated books because they're personalised, also front cover book art (the inspo on pinterest is amazing). though i do prefer annotating on hardcover books rather than floppy ones.
i think annotating one yourself as well as buying an annotated ones are both great options because they both have a nice personal touch. my friend once gave me a book that she annotated as a gift and it's really funny to read all the notes

I adore them! Personally, I like to annotate my books, but I also really enjoy flipping through the ones that other people annotated, because I get to see a look into their brains. Also, it would be cool to get that as a gift from a friend!

I love it when books come with an annotated chapter but I would never do it. For fear of ruining my book.