I wrote a post about ex ante prioritarianism some time ago, with some other references that might be of interest: https://forum.effectivealtruism.org/posts/bqcxp57hTybusvcqp/ex-ante-prioritarianism-and-negative-leaning-utilitarianism-1
More recent objection, probably basically a money pump (I haven’t read the article): “In this article, I argue that Ex-Ante Prioritarianism suffers from much the same problem: it violates a sequential version of Ex-Ante Pareto, that is, it prescribes sequences of choices that worsen the expectations for everyone.” https://www.cambridge.org/core/journals/utilitas/article/exante-prioritarianism-violates-sequential-exante-pareto/EC2F27EC7F39D4BC009AC76C86F1C7F7
I wrote a post about ex ante prioritarianism some time ago, with some other references that might be of interest: https://forum.effectivealtruism.org/posts/bqcxp57hTybusvcqp/ex-ante-prioritarianism-and-negative-leaning-utilitarianism-1
More recent objection, probably basically a money pump (I haven’t read the article): “In this article, I argue that Ex-Ante Prioritarianism suffers from much the same problem: it violates a sequential version of Ex-Ante Pareto, that is, it prescribes sequences of choices that worsen the expectations for everyone.” https://www.cambridge.org/core/journals/utilitas/article/exante-prioritarianism-violates-sequential-exante-pareto/EC2F27EC7F39D4BC009AC76C86F1C7F7