Seems that api has changed pretty much since a few versions back.

Correct, notice that your old pipelines Tasks use the older package and will still work.

There seems to be no need in 

controller_task

 anymore, right?

Correct, you can just call pipeline.start() 🙂

The pipeline creates the tasks, but never executes/enqueues them (they are all in 

Draft

 mode). No DAG graph appears in 

RESULTS/PLOTS

 tab.

Which version are we talking here ? v1.1.2? or the latest from GitHub ?