@nm i am interested in your activity and all of your nice posts ...
i am not an expert but i found duplication is helpfull in some cases for new users or who only works in a limited criterion for their own purpose .
-for example suppose i am only familar with the commands of Student:-LinearAlgebra: package , then if the Diagonal(A) command removed from here , it make me needful to refere to MTM:-diag(A) or LinearAlgebra:-Diagonal(A) and subsequently i must spend a lots of time for underestanding the functions in such packages too... that cause confusion and exponential increase in time needed for focusing .
the discussable drawback that remain here is only in different benchmark results of those diferent commands with the same puropse ! and underlaid structure ...
-also i have the same idea about notations because some of them are easier according to person , place , time ... so they must not removed !
-about help document of maple :
in comparsion with previous version of it , great and valuable updates made by maple developers although it is not flawless, and the exploration method for subjects and tracking of pages linkes into the current page are very useful .
totally i prefer the style of maple help and i wish their developers make it better with more facilities and troublshoting !
can you believe when i tried to remember the simple formula for surface/volume of a sphere or cone ... and i searched the standalone document of Mathematica i got noting ! that made me crazy ...also i can't find a definitive way for exploration in document of Mathematica and you will reach constantly to some pages circulary !