SCH lacks a single target mitigation ability

[UkcsAlias]

That's not a job balance issue

Not entirely, it can be a coding issue that is part of the balance of a job. Lets say you use living dead and your HP is exactly 10k in the normal case. If you now get 10% extra, it becomes 11k, and walking dead now triggers. If expedient ends, you have only 10k max. Lets say the 2nd healer uses benediction on you, effectively being that 100% heal. What happens?

If the game considers the value on start, you die.
If the game considers the value on end, you are safe

Since its not described when the value is decided, its guessing.

(and yes, this similar behaviour works acros many aspects. but this example is easier to follow due to its very slow progress in what happens)