Why in many organizations, operations management discipline is considered as a less important discipline?

let start form the beginning let me explain what is the meaning for Operation management  

Operations management is an area of management concerned with designing and controlling the process of production and redesigning business operations in the production of goods or services. It involves the responsibility of ensuring that business operations are efficient in terms of using as few resources as needed and effective in terms of meeting customer requirements.

Example Bossiness operation and commercial operation and Risk operation they all a part of the Operation Management  

If you want to know the real answer for you question???

The operation management it a very important Concern

but it depend the managers(like head of operations or director of operations).

those  people responsible for those type of operations  if those people have strong Skills for the Operation management and care of their team work for One goal it mean Top 100% and if the managers poor Management Skills it mean the less Important as per your question 

and also the staff : and if you love, believe in your job, do your best and look at you job like part of your family. but if you not ,,,,,,,,,,,,,,,,,,,,,,,, less important Pooooor 

and i advice you 

-First need to understand what is the meaning of the real operation management

-Second you need to believe in your job and understand it properly

-Third you need to do your best to be creative in your job and make it more stronger