[_nx010_]

Probably because it's proponents didn't have enough clout in the party, and faced too much institutional inertia.

Reading the manuscript, that appears to be the case:

>Industrial managers and government bureaucrats opposed the computerization of economic planning and management because it exposed their inefficiency, reduced their power and control of information, and ultimately threatened to make them redundant. On the other hand, liberal economic reformers viewed Glushkov’s proposal as a conservative attempt to further centralize the control of the economy and to suppress the autonomy of small economic units.

In other words, for entirely practical reasons. Not because evil communists didn't want people to have too much freedom, as the top comment in this thread suggests.