What does that even mean? There's no reason for different jobs to perform the same with the same strategies.
And this is what you misunderstand. No one is asking for AST to perform exactly the same function in the previous meta that WHM/SCH would have. They're asking for them to be able to match/compete with their own meta. Currently, AST doesn't compete in the previous meta or create their own, new meta which can compete with the previous one. This is what leads to AST not being taken in progression groups.