Hello!
First I'd like to preface this anwser by saying thanks to all participants in this conversation and sorry for not replying earlier. I've been busy at work in addition to preparing for my honeymoon so it kind of slipped out of my mind!
Anyway, I see that the consensus is either DON'T do it or keep it to a minimum. Arguments are (in random order and not limited to):
I do agree that some writings of gaming systems exist solely for the benefit of following a popular trend. But litRPGs have not become popular without reason. As you said earlier in your reply, litRPG use gaming methods to create conflict, tension and progression which can be done with regular storytelling. However, what this particular writing style mirror from games (imho) is that sense of accomplishment and the spike in dopamine you get from trad RPGs.
Now I join you on the second part of your answer. I agree that writing systems should only be used to move the plot forward. Not adding too much unnecessary complexity is the hard part, hence my creating of this thread.
That's a big "issue" in the whole fantasy genre in general. Species add to the mix. An elven or vampire girl can absolutely reckt a grown man. Think of Buffy the vampire slayer (yeah I'm old) where a vampire girl will easily kill a grown man and in turn be killed by Buffy a skinny schoolgirl. Or Arwen in LOTR, an universe male dominant. C18 in DBZ (btw can we say that DBZ is a precursor of litRPG with the famous "It's over 9000!"?
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My point is that litterature didn't wait for litRPGs to represent overpowered little girls. For me as long as the character is in line with the lore the author created, it is fine.
That's the whole point of my thread. I agree that too much details is no good. However what I want to know is where to put the line between realism (having a logical numbers progression) and ease to read/follow.
Video games use litterature for their plot, why can't litterature use video games to enrich itself?
So it is a bit of a spoiler but who cares.
I planned for my character to use a certain build, using up all of her stat points. She then fight a strong enemy and realise she should have kept points available to adapt her strategy when needed. She will do that from that point onward. Then she meets another strong enemy but will be overpowered and will not have time to add her points until a certain thing happens and she finally adds her points, effectively shifting the flow of the fight. Would that count with what you are suggesting?
What an interesting point. Unfortunately I'm too far into the story to shift to such a system but I have plans for a follow up story where it could make sense. Concerning the visual parts, I have been trying to do that on my first chapter but I suck at photo editing and need to watch youtube tutos for every modifications I try to make 
To finish this, I understant that tapas is not the best target audience for litRPG. I've got a somewhat better feedback on another website I'm not gonna explicitely mention. But the community in Tapas looks really nice and caring so I wanted to also share my story here.