Because I too followed the common advice and started with Django (I only knew Python back then). Well, I hated it and got burnt out as a result. So, despite the conventional wisdom, I decided to change my stack from Django/Python/Celery to Rails/Ruby/Sidekiq and I am very glad I made the leap.

I have seen both sides of it, that's why I decided to vent it out.

P.S. Don't get me wrong, I have tons of respect for people doing open source and don't want to badmouth Django folks. But in my limited experience, it just wasn't a great experience.