I don't have Designer, but I know how my monitor (and windows, and my Quadro) anti-alias by default without any up or down-scaling. That's all I want.
To fake some lower resolution with a 72ppi pixel view is lying to the user about monitor settings, and the documents underlying resolution (with raster images.)
Document Setup has a DPI setting, and it's set to 300ppi in this case. So, Pixel view should take One pixel of Document and translate it to One pixel of Display. AND it should take Vectors with no inherent pixels and Rasterize them at 300ppi, obviously.
If I wanted to work at 72ppi as the document standard, I would set that, and would expect to see pixels all day long.
If I wanted 2x Magnification or 3x (for 300ppi) to make the pixel edges visible, I would zoom (B/c 4k). There's a reason why Photoshop's pixel grid overlay only appears at 2x actual pixel res.
Am I missing some "Gotcha" in the User interface design logic of the devs?