Display resolution - custom field in Document Setup and the links panel.
Display resolution should be a custom field in Document Setup and the Links panel, and should set the default scaling of placed images in the document.
Right now, linked or embedded 'RasterItems' have a default scaling resolution of 72ppi, and you can't change it. But 72ppi is an anachronism, it doesn't reflect most use cases.
The impact is that placed images appear in the document much too large, and it wastes a lot of extra clicks to resize placed images. That could all be avoided if there was a simple way to change the default display resolution to match the resolution for the intended output, whether it's a screen, print or whatever.
Note - I'm not talking about document raster effect settings, that's a different - but related - thing. The raster effect settings resolution should follow the display resolution - while remaining a separate option.
Also, for the sake of clarity, not I am NOT talking about the resolution of the Illustrator user's display. That's... not relevant.
Mark Nicoll commented
I mean, I do know that to change 72ppi to 300ppi I just scale by 24%, and I've got an action to do that - but it's still an extra unecessary click every single time I place a raster item - even if I had any space remaining on my F keys for it to be shortcut!