For me personally Logseq filled the gap of Obsidian to have something fluid enough to handle quotes. In some cases quotes get their own page and in some other cases I reference to them inside the page of the book they’re from.
In all cases I write my own thoughts to the quote. Through the fact how nodes work in Logseq I can write tags behind the nodes and link to the book (for e.g. #Quote #Bookname). This makes it possible to query for all quotes or specific quotes from specific books, topics or whatever.
In Obsidian this was my primary struggle: Not being fluid enough so I had to create a separate page with a quote and my opionion, had to keep a basic structure and had to find a name for that page (one of my biggest struggles) and so on.
I tag them with #quotes and the subject, if needed with the book title, but usually the subject is enough for me to find the quote.
If I have many quotes for one book, I might group them, but for now, I don’t mind, I tend to search on subject anyway :)