I've actually brought this up in the discord before the answer i got is that shes promising to focus on main content again which then led into the argument of what "main" content is for instance the fields which are a completely side thing are considered main content and apparently it has been the major hang up in development
To be fair, the fields being a new area that must be traversed as part of the main quest is what makes it main content.
Now, quests solely within the fields or something like the quest that was the match that lit the powder keg on the blog, the Nyan rework, THAT is actual side content.
Side content is content with no real connection to the main quest, main content is anything that is connected, like the quest itself, an area that has to be traveled through to get to the next step in the quest, or an area where the next step takes place.
Dealing with the Imp gangs and fortresses in Submission is main content because that is how you get access to Lyssieth, but in that same area, the Rat Warrens quest is side content because it is not required. Submission itself is maon content because that is where Lyssieth is, but the Gambler's Den is not because it is an area not required to prgress the main quest.
The next main quest zone is Elis, which you must travel through the fields to get to, making both of those areas main content, but any farms or other areas in the fields are side content barring any you have to go to on your way to Elis as a main quest step.
Hopefully this makes it clear enough what distinguishes the two, I'm not sure how much clearer I could be.
On a separate note, I hope the Discord didn't treat you too badly, they seem to dislike anyone talking about the main quest or anything else they aren't focused on.