Should SE scale high end content difficulty towards the usage of SIM ?

[BigCheez]

Then the question becomes, why are checkpoints not an option?

( the answer is pretty obvious )

I don't understand what this has to do with the point that I made.

Being able to practice part of something in isolation does not detract from the difficulty or consistency required to complete it from start to finish in one attempt. Adding a checkpoint would mean that you don't need to complete it in one attempt.