How does the forgiveness actually manifest in real world scenario. In what way would DTX feel different than SC? From my limited understanding the main difference between those two is that DTX is much more flexible with varying the turn radius.
I really don't have too much experience with that many skis, in recent time I only skied on amphibio (I think it was 14 Ti) which I enjoyed and got a feel for how edges actually work for a first time. After that this year all other skis where slalom ones, Fischer SC, SL and Redster S9. Compared to the amphibio if I could sum it in a few words, they felt snappier and less skiddable when turning. But they also tend to throw me on the tails and it's a bit more difficult to control speed than with Amphibios. In a way that seems like a positive since I'm immediately aware that I messed something up, but I'm not sure if that is a good approach.
Like I said, my goal is to be on a ski that will allow the best learning of carving technique, whatever that be.
I'm most likely gonna go on Sunday on one day skiing, so I'll test out boots. I'll rent some skis again for a day so if you guys have suggestions what to rent, shoot

I'll try to find an instructor for that day if I manage. I go to skiing in a neighbouring country so it's a bit trickier to find someone due to language barrier.
First a caveat. Fischer (and other companies) make it hard to compare skis by name, even if you don't need to include how skied out the ski is after x years and y thousand miles. The names are all similar, and change with the years. There is The SC, the RACE SC, the SC Pro, the ....ad nauseum.
Nevertheless, I find this site does provide some interesting data, which I will use to explain how that forgiveness will manifest itself in the real world
https://compareskis.shinyapps.io/compare/?_values_&selected_rows=[3576,4434]&tab="Compare"
I compared a Fischer SC with a Head V8.
If you look at the data you will see that the most noticeable difference is that the SC is much stiffer in bending and in torsion than the V8.
What the V8 does for a beginner is lessen the amount of force required to bend the ski into a nice tight carved turn. That means you can learn to make turns at a slow pace, without a lot of force being used; you don't have to be skiing at the upper end of the range of speeds for which that turn shape is possible to be skied at. That gives you more time to see and feel what's going on. It also makes the ski almost want to turn as opposed to needing a firmer command to make it turn.
On the negative side, the V8 will reach a point much sooner (at a lower speed) where the ski just can't hold the turn you want to make. You will be drifting that turn whether you want to or not. It won't give you a high-g turn on hardpack; it will slip off the desired line like an old buick with bald tires in a turn through a deep puddle in heavy rain.
The stiffness of the SC will definitely make the ski turn if you give it the right input, even if you don't want to turn and gave it that input by mistake; it will feel "hooky" to people who don't want that strong response. They will ruin the ski by filing off the tip and tail edges so the skis won't force them to turn when they command (by making the appropriate movements) the tips to engage and make a hard left (or right). With the V8, it will try to turn, but if you don't like what it's doing you can force it not to turn, using brute strength.
Also the relationship between how much you tip the ski versus how much it wants to turn is not linear. It's closer to the cosine function. At low tipping angles, it's not that far from linear, but at high tipping angles it's closer to an exponential function. You ask for more turn and tip 5 more degrees at a low tipping angle and all is good - you turn more. You ask for more turn and tip 2 more degrees at a high angle and all of a sudden you have dialed up an impossible turn, the stiff skis hold onto that impossible turn like a banshee, but your body doesn't make the turn, you go over the skis and get catapulted into the air and land badly - very embarrassing.
Also the SC will be stable at a much higher speed. The higher mass helps there. The extra mass is probably just a result of the materials needed to provide stiffness and vibration damping, but it also helps with stability in and of itself.