"Guys, there seems to be a lot of misinformation here. I've leveled a monk to 108 with this most recent build to test the campaign out. Yes, there is a garrison aspect involving sending out certain followers to do little tasks for you.
HOWEVER, and this is a big however, so far these have not been the main focus when it comes to how your character interacts with the campaign. Yes, there are special missions that you need to send your character out on, but one in particular that the article missed happens just after you investigate the monastery.
Basically, your follower calls in backup because the situation is too dire and they need you to mobilize your crew to fight back an invasion. This leads to an invasion effort out in the world and you push back the legion and start another questline that I haven't unlocked yet. This leads to the monks of the class hall to prepare for war and start a war effort of personal training (done by your character in the open world), and AQ style war effort (I had to collect 500 fish and that's taken me a few days), and the introduction of a new trainee class that you can use to do missions.
It's not just garrison simulator 2.0 and this article barely touches the tip of the iceberg."