Well checking embeddables for (non-) equality is one thing, but other comparison operators are not so easy to support.
How would hibernate know the order in which you want to compare things?
According to the SQL-92 spec `(a,b,c) > (x,y,z)` means: `a > x OR (a = x AND (b > y OR (b = y AND c > z)))` which is dependent on the order of the elements. Since there is no defined order for columns of an embeddable, I don't see how this could work out.