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It's good practice to declare an optional `modifier` parameter on my own composables and apply them to the outer-most composable in that function, right? Is the same also the case for my composable that just holds the entire screen content? it's not reusable and I don't need to pass any modifiers to it since it's handled internally.

If your composable is internal and doesn’t ever actually get passed a non-default modifier, then yea you don’t need the parameter.