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

[Absurdity]

I also honestly don't see the issue with it, obviously it should not affect their content balancing since all that tool really does is let you practice mechanics on your own.
Is it a problem because you don't have to sit through 3 hours of party finder with people lying about their prog and wasting your time before you can actually practice the mechanic you need practice on?
Oh no, the horror.

You're still just practicing movement and you ultimately still need to do the real fight in-game.