Wall of Text but worth reading in my opinion. I'd like to know if there are other people out there which do the same thing as I do.
I totally understand the OPs issue. I too like to play my RPGs with well more roleplay value. I do roleplay my character in-game. I usually begin any RPG {not action RPGs which have no real story and no real RP values} by deciding what character type I'm going to play. Even before the game begins! For example when I started playing the Witcher 1 I've already decided that he will be a totally professional monster-slayer who doesn't like to interfere. He only want to get in, do his job, get out. I played the entire game with that philosophy in mind. I continued playing Geralt that way in TW2.
I did that for Dragon Age 1 {never played Dragon Age 2 after seeing what a piece of crap it was}. My mage there was a misanthropic power-hungry mage which happened to be in a situation where everyone counted on him to save the world when all he did was trying to get the world to serve and revere him. And it worked! I had a blast.
My commander Shepard in Mass Effect was a bad-ass soldier which was totally pro-human and tried his best to undermine all alien efforts while pushing humanity at the top tiers of galactic power.
These are the things that I enjoy when playing my RPGs. I do not like power-leveling, I do not like min-maxing stats, I do not care about tons of loot and I absolutely despise playing and choosing the best option in any dialog which may be helpful to my character in terms of XP points, loot or money at that time but completely out-of-character for the personality that I've chosen for him at the beginning of the game.
To put it in a few words if a dialog choice will obviously give me more items, levels, experience points or any other practical and GAMEY advantages in general BUT it is a choice that the personality of my character that I'm roleplaying would NEVER EVER say then I will choose the other option without hesitating even if that means that I will gain less or even lose some stats/info/levels/items/whatever.
This is what roleplaying is all about. Any game that lets me do that is worth playing and worth calling itself an RPG. Every other game that just has leveling, item equiping and generally RPG elements without actual roleplaying is NOT an RPG even if the industry like to call them that {or action-RPG as they are now more usually called}. These are NOT RPGs.
To get back on the OP's issue my first playthrough where I'm probably playing on the Normal level of difficulty and I'm encountering situations for the first time is what I call my 'official' playthrough.
This is the story that my Geralt lived, those are the facts that in my gameworld are written in stone and won't change. This is the savegame that I'm going to keep for the next game since this mechanic of save transferring will be the new standard for RPGs from now on.
BUT after I've seen the 'true' story of Geralt I do have a hell of a lot of game content to see yet. I cannot let that content underutilized. So I restart the game and play again in order to live new 'what if' situations of the same story. This is not MY story, not my Geralt's story. This is another story. Just like a parallel universe!
I do not care about what happens to that Geralt, I do not roleplay that Geralt, I do not care if he does out of character actions anymore. This playthrough is something that never officially happened. It's just a part of gameplay that allows me to see some things that CDPR put into their game for players that will make different choices than me and I want to see those things.