This comment seems backwards to me. If you're funnelling incoming messages in to hundreds of topics (or less) Kafka is a great "fat pipe" if you need millions (or tens of millions) of topics for IoT devices, MQTT is much more designed for that usecase
Disclosure: I'm biased - I've worked on the MQTT spec and I'm the lead for Eclipse Amlen
Disclosure: I'm biased - I've worked on the MQTT spec and I'm the lead for Eclipse Amlen