Another is that well-known attempts at checked exceptions in practice provide an incredibly limited vocabulary for talking about raised exceptions - usually jus

Another is that well-known attempts at checked exceptions in practice provide an incredibly limited vocabulary for talking about raised exceptions - usually just unconditional "might raise X" or "does not raise X". If you could say things like "raises anything raised by my argument f, except for X because I catch that" it seems like it might be a much better idea (especially if you can infer those...)