TL;DR: Use Gulp 4 if you care about task management. If you can't use Gulp 4, use Gulp 3 with 'runSequence'. Also, I need to start reading documentation more and assuming less.
NOTE: You see the code over at Github.
The release of Gulp 4 is right around the corner, but you can already use it on the 4.0 branch. Here is why you should.