Basically, sometimes one may find out too late that a book isn’t quite up to one’s taste. The book might not be gripping enough due to many factors. In such case, would you quit reading it? Does the amount of progress you put in make a difference? Or would you be nontheless determined to complete despite not feeling any meaningful connection?
In Ali Abdaals video on learning from audio books he says that its OK to not finish a book if its of no use to you, or you’ve got all you can out of it. I agree with him read what you enjoy
That’s a healthier mindset now that I think about it.
I have really bad ADHD, so my book reading involves reading the first 30% of a book, then swapping books because I found something new and exciting. It’s dopamine chasing and I have a sad large pile of unfinished books.
For fiction it depends how far along in the book I am when I lose interest. If it’s still early on and I am not feeling any connection to the story or characters then I can drop it. For non-fiction I can drop it at any point I lose interest.