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

[Collin_Sky]

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.

He means a checkpoint to practice a phase in isolation.
That said, my response to this would be that it's pointless and actually harmful. You will have different resources in a checkpoint pull than you would in a proper pull, so you can't really practice things and probably actually are more likely to ingrain bad habits/expectations of what you can and can't do when you swap from checkpoints to full run.