All of your arguments are 100% legit and I wish I could live with it that my MC PRO’s faders and Soft Knobs show levels like -0.02dB (for instance)…but I can’t…
My -neat & tidy- psyche wants it to be exactly at 0dB or -10dB, or +3dB, and not at -0.02dB, -10.17dB or +3.1dB… that’s why I’d love to have an option in Nuendo’s EU-Con implementation which says: “round dB-values off to half- or whole numbers”…
I work a lot in live sound. The DiGiCo-consoles which I work with most, have an user-option saying “round dB values to whole numbers”. I know the underlaying audio is not rounded-off…it’s only the reading on the display which is being rounded off…that kind of option would come in very handy on my Nuendo/ MC Pro rig… 
Thanks!
Niek/ Amsterdam