Other writers basically 'anxiety gatekeeping' amateurs by setting up all these arbitrary rules about what can and can't be good writing, like how many drafts you should have, how long you should spend on each chapter, how many words you should write, how much dialogue you should have, etc, etc.
If I listened to all the advice I heard along these lines (including decent, well-intentioned advice) I'd never finish anything. =/
I understand that good writing takes real, hard work, but there's got to be a better way to express that than making a book seem like a jail sentence, where you're not "really" done until it's taken up some significant portion of your life.
My advice would be, if a book seems easy to write, let it be easy. If you feel like showing it off after just the first draft, go ahead. If you don't want to edit anymore, stop. If you can't make it to 100K words, don't force yourself to.
Let your writing stand or fall on its own merits, on what you think is best for the story, not on other people's one-size-fits-all ideas of what the writing process should be.