Here's a recent article we did on the Oscars. This mentions diversity as an issue and offers a proportional nomination as a solution.
There is, however, an argument for a bloc method for nominations. That's because using a bloc method, particularly with a cardinal method will tend towards a collection of winners around the median feeling of voters. This helps to ensure that the best candidate is contained within the nominees.
If the issues external to the voting method were resolved, do you think it would be more appropriate to use a bloc method or a proportional method for nominations?