That is quite another story. What is good for the man and what complies with the regulations.
The JAR-OPS1 (Appndx to 1.770) in certain notes speaks of
"constatnt rate of descent from the plane's max certificated ops alt to nn nnn ft in mm minutes. Still, I believe it does not in writing preclude an intermediate level-off in order not to hit the ground or for other reason. Wheather it is wise, I do not know.
On the other hand I think it is common sense that if two manual have different limitations on a same issue, both need to be met.
No matter the good will of all involved sometimes a discrepancy will be created and then it is up to the expertise of oversight authority (but they're folks like us anyway) or someone like you who cares enough to notice.
FD.