Tornado still too low level. - It's verbose compared to flask. - It reinvent the wheel, while flask uses great components such as werkzeug. - If yo

Tornado still too low level. - It's verbose compared to flask. - It reinvent the wheel, while flask uses great components such as werkzeug. - If you want to make a component, it's complex. - It doesn't come battery included for the Web like Django, just the bare minimum. - It misses the opportunity to provide task queues, RPC or PUB/SUB which are key components to any modern stacks are made easily possible by having persistent connections. - It ignores async/await potential of unifying threads/process/asyncio and don't allow easy multi-cpu. Don't get me wrong, I think tornado is a great piece of software, but it's not match against innovative projects we see in Go or NodeJS such as Meteor.