Click to see this devourer's page.
Only thing it changes is that a defender who plays full 11 can now never be beaten... I assume you thought about this and thought it's as it should be..?
That is a good thing. Before, a defender who bid 11 could never be beaten ... unless X, or Y ... or Z if A ... or B.
Now, there is no longer a need for everyone to memorize every possible scenario where there might be a surprise +1 to war.