Most of them were foreign owned and ran firms/industries when the Kacaan took over.
For example electricity before being nationalized was monopolized by 1 small italian company and served to give electricity a few Italian expadriates, after nationalization electricity was made available to all Somalis across Somalia.
Nationalization of all schools for example took away the british and italian elite taught monopolization of school system that alienated majority of Somalis. Prove to be instrumental in the spread of literacy in the end.
This only to mention of few positive changes nationalization brought.
The 1960-1969 government was corrupt, maladminstrated , had an economy run by colonialists, rife with violence, even led to the assassination of the President, and large funds was missing that would go to fund elections bribes etc that was intended to go to development , much of the intended slack and mobility was picked up by the Kacaan regime in the first 10 years.