So...it's a touchy subject in the indie world, but I think word count when writing a book is subjective to each individual.
For example, I've written on average 30,000 words a month this year. You might think that's a lot, which to most people, it is... However, I live on my own, write full time and have no dependents. I'm an introvert, which means my social life isn't exactly booming. Ha, don't laugh too hard, it's true!
Writing is my job. My full time job. So, if you were to look at the amount of hours of someone who works in the corporate world works, you would see that they get equal, if not more, work done than me a week. Just because that's not countable per word, doesn't mean it's not true.
I always edit my work and have a editor too. It's not like I'm chucking out words, and then publishing them straight away. I admit that I've made mistakes in the past. Probably not given quite enough attention to the rules of marketable books, but I've still managed to write 20 complete books.
I believe that word counts should become a habit. Once a writer can work out the best amount to suit them, they will be able to stick to that each day. Therefore accumulating an eventual novel. Judgements on quality don't belong in this discussion. Just because someone writes fast, doesn't mean the the quality is low. It's like saying that a racing driver is a worse driver than a regular driver because he goes too fast.
Each to their own. Everyone has their own journey, their own life. So, if you're an aspiring writer, don't feel disheartened when you see that someone can write quicker than you. Practice upping your word count, and once you've reached your preferred way of doing things, let go and get on with it. Good luck!