Imaginary friend: "Hey, MC, you're like really really powerful, our former master gave you his awesome powers..."
MC: "Cool, how powerful exactly am I?"
Imaginary friend: "well, you're so powerful that you can, in your dreams, imagine that you are fucking someone that you have defeated in battle"
MC: "uh ..."
Imaginary friend: "Yeah I know, right? its really hard to grasp just how powerful that makes you!!"
...
So dream sex is the MC's secret power ... if the renders were amazing, from DAZ or something, then I could probably understand the motivation to view it, but really without those scenes actually doing anything for the story then what is the point? Could just go to pornhub and watch better quality sex scenes.
Someone is going to have to explain it to me, 'cause right now I'm not seeing a reason to not just skip those pointless optional scenes.
A bit like fights that don't matter, because even if you defeat the fire guy without taking any damage yourself, the scene after that its like you lost ... So what was the point of the fight sequence? could have just skipped to the next scene.