Raster Function Parameters — Auto-fill Raster picklist and make it clear that it's mandatory

[Bud]

ArcGIS Pro 2.9.5; color JPG

Background: Convert color image to grayscale: Failed to apply Grayscale

I'm new to Raster Functions. I had an issue where I didn't realize I needed to specify the raster layer in the Raster picklist, so I was getting an error: "Failed to apply Grayscale".

I see now that the error message in the History pane lists the cause of the problem:

But I'm still wondering if it could be more intuitive.

• Populate the picklist automatically using the selected layer in the Contents pane?
• Make it more obvious that the Raster parameter is mandatory, such as a red asterisk like other GP tools?
  
• Or something better?

[AlfredBaldenweck]

Yeah this one is such a simple thing and yet it bites me ALL the time.

Like, at a minimum put the star next to it, you know? Or don't run at all if that field is empty.