Just to add some of my own perception as someone who works on Mesos, Mesos continues to be popular with large technology companies that don't make their technical investments lightly: Twitter, Apple, Netflix, Uber, Yelp, for example. Companies continue to choose a Mesos stack based on its technical merits. The project is still moving fast and adding powerful primitives to support the needs of production environments while distributions like DC/OS are trying to make Mesos more approachable (easy to install, administer) and comprehensive (providing solutions for load balancing, logging, metrics, etc). I hope you will take another look at the Mesos ecosystem at some point, a lot of care has gone into it :)