Or simple they scratch them late, because the realised that the numerial LI4 variable, don't add anything to their ideas/vision and the whole pathing (if they have any) for LI4 is enough.
But here it's worse, there's almost nothing at all behind.
Remember when Sharon bring MC to a club for the first time ? Be charming and be stealth, you'll need it if you want to nourish yourself. God, I wonder how the promise behind this feel to people who starts the game now, playing the five episodes and never ever having to care about nourishment except this single time that was totally scripted.
Like I wonder how many feel misled, if not betrayed, by this, because being able to nourish yourself is more important at first than being able to fight. Therefore, they focused on their stealth, expecting a "okay, now I should be able to nourish on my own, time to train something else", scene that never came.
Oh, of course, your training levels have their importance. They give you some powers... Or, more precisely, some abilities that aren't totally useless, because they open some doors, but still totally meaningless, because if the door really need to be opened, then a key will magically appear.
Take the fight against Marcius by example, because it's really significant. There's three possible issues:
1) You trained enough your fighting, and then in the chapter 3 you gained a power that will let you win. But you don't activate it, because it don't show up in the power screen selection right before the fight. You have it, and you'll use it, but you can't choose it.
2) You don't have this power, but don't worry, there's a special power that everyone have without knowing it ; and that surely everyone used, unless they had the "bugged" version of the release, simply because the choice appeared and, well, who would refuse to use a power when having to fight Marcius ?
3) You are far too confident and you'll die.
They haven't thought this beforehand, and I bet that they haven't even thought it when facing it ; hence the quotation marks above, if you see what I mean.
You don't face different way to solve the issue depending on the training you choose. No, either you trained
that way, or you use the cheat code they give to everyone for free. And I bet you that, when the time will come, the same will happen for those who haven't trained enough their stealth, and therefore haven't eat Marcius.
I still expect (or is it "hope"...) that all this will have it's importance in the end. But I'm not naive, it will just change the ending scripted scene. You'll be told that you became fine diplomat, or a rough ruler, nothing more. In between, don't worry, and don't care about what you choose to train, you'll be free of any bad issue and progress at the same pace than anyone else. Either thanks to your choices, or thanks to the cheat code they'll give you.