The revealed potential thread!

I think the way it works is based off of the old job advancement system and what job level you would have gotten the skills on normally.

For example, since Door and CO are both 3rd job skills, you can get them on equipment that's 70+.

For SE and AB, since they're 4th job skills, you can get them on equipment that's 120+.

That's how I thought it worked at least, I could be wrong.

You are correct on that. They probably kept it that way too so that you couldn't get tradeable decent 4th job skills....