Since C12, the possibilities of navigating Cubase with the keyboard (Tab-key, cursor-keys), as is common in a lot of other software, have been drastically reduced. See for example the mix console, where with C12 I didn’t need to use the mouse if I wanted, I was able to navigate e.g. the inserts horizontally and vertically with the cursor keys, use the DEL key to remove the current insert, then use TAB to go to the send section, move around there and increment/decrement values with shortcuts. Mostly, all gone now.