Well, if we allow Q (defaulting to fQ) as continuation after an oblique, we should also be prepared to interpret other angular modifiers there. And we probably don't want [N-frQ] to default to [N-frQ][N-frB], as fr has different meaning on orthogonal and diagonal atoms.
We could treat K/Q after oblique as a degenerate 8-fold case, though, where f represents the nearest orthogonal and diagonal directions. That would amount to the same thing for the case you mentioned.
Well, if we allow Q (defaulting to fQ) as continuation after an oblique, we should also be prepared to interpret other angular modifiers there. And we probably don't want [N-frQ] to default to [N-frQ][N-frB], as fr has different meaning on orthogonal and diagonal atoms.
We could treat K/Q after oblique as a degenerate 8-fold case, though, where f represents the nearest orthogonal and diagonal directions. That would amount to the same thing for the case you mentioned.