No, that is simply not the case when a multiple entry visa is issued (as is the situation here). So long as there was no misrepresentation or concealment of material facts during the application process, and that there has not been a significant change in circumstances since the application, the visa continues to be legitimately valid to enter any Schengen state at any time during its validity.

In the case of a single entry visa, obviously there is a narrower interpretation, and in that case it would be required to NOTIFY the issuing consulate of the change in plans (and not apply for a new visa). It is not possible to apply for a second Schengen visa while an existing Schengen visa remains unused.