On my keyboard - which is.. I don't want to say 'full size', because maybe it's '80%' or whatever, but it's a regular external keyboard with numpad - f & j are centre to centre 60mm apart.
If I outstretch my arms, straight, my index fingers are pretty much in line with my shoulders.
So no, when I use my regular unsplit keyboard my hands/wrists are not straight, because my shoulders are not 60mm apart..? Am I missing something?