"Stat Suppression" is such a stupid plot device to villainize the sister. What low stats, MC could move like a ninja in chapter 44!
How did MC even get "unlimited" from? Normally most people would think that something extremely powerful and convenient like automatic resurrection can only be invoked for a very limited times.
And it's actually "Damage Transfer," NOT "Unlimited Resurrection." The sister took the full brunt of the lethal attack that MC took, so the price that MC had to pay wouldn't be that steep. Imagine if MC took a fatal hit to the head or the heart. The sister would die. The sister actually guaranteed MC at least a second chance.
Also the "Damage Transfer" is actually extremely important for the spoiled MC. MC is a borderline suicidal daredevil who kept pushing his luck so much despite his low stats, so without that buff I think he would have died in a ditch somewhere already.
Honestly. The sister spoiled him too much.