I hate the full-size left and right arrow keys because it means I can't easily use my sense of touch to find the arrow keys. I mistype them all the time now, even after months of use. That was never a problem with the previous inverted-T design.
(Of course that particular problem would be less of an issue if the keyboard had home/end/pgUp/pgDn, which I'm still sore about, years after they got rid of them).
Arrow keys are so important I might almost want them all full size, in a "+" configuration.
It's a good 1.5" from the right arrow key to the edge.
It’s honestly not something that I ever really noticed with a 13”.