Is there a method that lets you hide icons, similar to how api.replaceIcon lets you replace them?
I am not following, where do you want to “hide icons”? That would typically be CSS, nothing to do with the API.
Bit of an unusual use case: I wanted to show and hide certain things for different trust levels and I didn’t think I could do that with css without invoking primary groups but I figured out how to do it via How to make a theme component for TL-based banner. 
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