They've publicly said no more language changes specifically for better error handling are coming, it will at most be the library-level improvements.
> Or, we could decide that parameterized methods do not, in fact, implement
interfaces, but then it's much less clear why we need methods at all. If
we disregard interfaces, any parameterized method can be implemented as a
parameterized function.
> So while parameterized methods seem clearly useful at first glance, we
would have to decide what they mean and how to implement that.
Well, they have finally decided what parameterized methods actually mean, and they see how to implement that, and it all seems clearly useful. So...