The original motivation for the efforts that resulted in Han unification was to help with library and bibliography management (some of these efforts were by non-CJK speakers). One of the original design goals of Unicode was to be able to represent all of the characters in existing character sets uniquely (so two distinct characters in some charset requires two distinct characters in Unicode), and another design goal was to be able to facilitate conversion between different character sets representing the same script. This dovetailed nicely with the existing efforts to unify CJK scripts for bibliographies, hence Han unification.
The original motivation for the efforts that resulted in Han unification was to help with library and bibliography management (some of these efforts were by non-CJK speakers). One of the original design goals of Unicode was to be able to represent all of the characters in existing character sets uniquely (so two distinct characters in some charset requires two distinct characters in Unicode), and another design goal was to be able to facilitate conversion between different character sets representing the same script. This dovetailed nicely with the existing efforts to unify CJK scripts for bibliographies, hence Han unification.