C3 error handling is fairly novel though. It tries to find a sweet spot between composability, explicitness and C compatibility.

The try-catch has nice composability:

    try {
        int x = foo_may_fail();
        int y = bar_may_fail(x);
    } catch (... ) {
        ...
    }

Regular Result types need to use flatmap for this, and of course error codes or multiple returns also struggle with this. With C3:

    int? x = foo_may_fail();
    int? y = bar_may_fail(x);
    if (catch err = y) {
       ...
       return;
    }
    // y is implicitly unwrapped to "int" here

This is not to say it would satisfy you. But just to illustrate that it's a novel approach that goes beyond Optional and Either and has a lot in common with try-catch.