Do you mean correcting pronation? You typically don't correct supination with orthotics.
In skates if your heels fall in or out you need to correct it.
I have odd feet and trust me, if you try to skate without an insert in your boots you're in for a painful ride. Of course, it also depends on the individual, their build, the extent their feet fall out, etc.
But just speaking form personal experience, I was ready to quit skating until I put a superfeet in my boot, because the feet rolling out (my heels roll outward and I have a med-low arch) was causing WAY too much torque in my ankles. Every stroke felt like my feet were being split in two directions.
After some blade adjustments (more like... a LOT of micro-adjustments... 2 millimeters makes the world of difference and can render you inable to get on an edge, etc.) and putting superfeet in the pain went away...
Instantly.
It went away, and it's never come back sense.
And now my left heel is coming off my boot, it looks like
But I'm about ready to get new skates anyways... These took too long to break in, and they still feel like they're half broken in a year later (probably[well, highly likely] overbooted myself).