What you're talking about in braindance which is like watching a movie but feeling everything within it as if you were there. That's quite different then Net-running, which is entering a virtual simulated world and controlling what happens within it. Which could manifest in a couple of ways by 3D environments or navigating raw code
Trust me I know, I think about this a lot. I am not new to these concepts, they just both have to do with a mind interface. I've been thinking that with braindance spots being everywhere (ie. on vending machines,apts) that they may be unofficial terminals or ways into backdoors for netrunning. I could be very wrong because we don't know anything yet, but I wouldn't doubt if they were related somehow.
Who is to say that someones braindance experience isn't easily altered with a few netrunning techniques, so that it may work like old propaganda. If I was a netrunner I would use any braindance vices against my enemies. It would be a perfect place for subliminals or to show something that would invoke a profound emotion.
Imagine you tweaked a persons braindance enough to where they proceeded to carry out some dirty work because they were thinking an illusion was truth.
Even nowadays we can induce certain emotions from deep fakes. If you got your hands on a homemade porn video and mixed up some faces, it could lead to someone getting killed. Or maybe PTSD could be invoked via braindance. Lots could occur.
IRL we are even having problems trying to discern what is fake from reality. In 2077, I'm pretty sure it has been taken to an extreme level and netrunners there got it down to a science by using everything they have at their disposal. Including getting into peoples heads via braindance if needed.
I would also create my own braindance scenes as a netrunner that I could use if a mission needed it. That's what I was mentioning about creating braindance themes or situations for your "own netrunner room" on the net. You may want to share beautiful things with your friends or keep some crazy braindance scenes for when you need to f with the heads of your enemies. All in all, they are kept as tactical options for the netrunner.
And I could be completely yucked up and wrong.