Company culture is difficult to change. IBM culture is so ingrained it would take a decade of seriously hard work and purging of non-adapters to change.
I worked for three small software companies that were acquired by IBM.
Each time IBM said we will not change your great culture, we want to learn from your culture and fix our culture. Each time there was a brief honeymoon period, followed by bluewashing of the products and people, followed by voluntary mass exodus of the employees of the acquired company, followed by IBM destroying the products we worked so hard to create.
The first time I believed IBM and hung around IBM long enough to understand IBM mechanisms. The second and third time I exited immediately.
One day I asked my IBM manager at the time - Just how did IBM expect to create and develop new products with all the rules,hierarchy,procedures,silos,endless meetings,separations of duties - his deadpan answer was “We don’t, we buy it, or put competitors out of business with lawsuits”.
Now I am seeing the inverse happening. The company I work for brought in a laid-off manager from IBM, who began to infect our company with IBM culture. He has since hired some of his IBM buddies thus accelerating the infection.
IMHO Don’t hold your breath waiting for the IBM culture to change. The managers, directors and on upwards create and protect the IBM culture as they understand how to manipulate the system for personal gains.