This is actually it. Netflix looks at completion ratio - how many people started the series or season, and how many finished it? But when Netflix was new and binge was the thing, that worked. Now? Most people I know watch an episode, or a few, each week. They don't binge the entire series in a sitting anymore. Netflix is canceling shows while people are still actively watching them and are being tallied in the non-complete demographic. They're impatient, and it's leading people not to start series until they've been picked up for the next season at all.