That would be true if not for Java making the critical mistake of excluding RuntimeException from method definitions, so in-practice people just extend RuntimeException to keep their methods looking "clean".
interface Func<P, R, X extends Exception>
{
R func(P param) throws X;
}
In principle, one could imagine a syntax for variadic type parameters like
interface Func<P..., R, X... extends Exception>
{
R func(P... params) throws X...;
}