This is not strictly necessary since illink is going to warn when arguments are not understood (or do the right thing otherwise), but we might have other tools that also look at them (E.g. the Roslyn analyzer).
E.g. some of these methods are (I'm annotating them):
#53081
Here's the full list:
https://github.com/mono/linker/blob/4526d388102db2dc481522d9dee92b8f32414b23/src/linker/Linker.Dataflow/ReflectionMethodBodyScanner.cs#L304-L627