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According the recent 18.0 release presentation, it sounds like they are aware of how different an experience this is relative to other interpreted "scripting" languages. To that end, they have added support for a Run function that will execute with access to to the invocation arguments.

EDIT: They also discuss how the upcoming convergence of .Net Framework and .Net Core is going to have a major impact on their cross-platform capabilities.

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That is great to hear; perhaps some of the issues I have will be addressed when version 18.0 is released (which, despite the present tense in your comment, hasn't happened yet). I really hope so – as I said, there's a lot to like in APL.