what extra? do you mean bredita telling about what you missed by making "right" choices.
that depends what you want, if you want to see all scenes then yes but if you are satisfied on what you get (most scenes) then no.
The scene After the dream scene. that thingy.
What I feel is that the balancing point should give you the middle path, meaning you can see both options at the same time. Since this game kinda forces you to strictly become "one boring lover or horny mf" ykwim
Both "Classes" are boring, if the game forces you to stick with one "Character class", this formula it's doesn't work IMO for VN games, since it's based on dialog as you may know, we got bored fast either being only good or being only bad character.
I think I play some games with good choice progression which gives you fully possible choice. So based on that, the dialog will feel "natural" since the game only tracks the point in the bg, but still gives full possible choice to the player, and if you didn't meet the "criteria" then the "NPC character" just act different according to the stat we have.
One major problem with VN is that most of them try to make things replayable which doesn't make sense.
This forces the player to be "someone else" again, basically an inception inside an inception, and didn't feel good to make the choice and backtrack the choice again to get other things. ykwim
Basically, trying to give an illusion to the player that He or She didn't miss anything and balancing points around that is a hard things to do. xdd