I’m surprised they teach that to be honest. (That’s not what I’ve been taught which is more along the lines of have your own ideas of how the story is to progress but listen to feedback and decide whether to act on it. It’s not to say you shouldn’t have your own work and style, but there’s nothing wrong with listening to what people want. You’re talking about making it into a commercial product after all rather than just a personal piece. If the advice doesn’t fit your story line, you’re under no compulsion to fix it in that exact way, but you still know it needs to be changed. That’s especially true if you have multiple people telling you the same thing, you should definitely listen. If that’s the case you need to justify why you can ignore the advice rather than the other way around. It can sometimes also give you some great ideas for story lines and character interactions. Sometimes people will see my characters or the MC in quite a different but still very valid light to me.
I find IF to be quite different to standard novels where you can get away with less feedback in my opinion because they’re your characters, acting how you decide the story is going to play out. IF is interactive, people want to be able to have a particular amount of freedom which testers can pick up for you. For example you may have decided the story needs to go in a particular direction but a lot of readers hate that words are being put into mouth so to speak. A few extra choices or a bit of rewording to show why something has to be that way will result in a much happier audience long term.
Anyway, good luck with it