Why have you left HPCL to join NITIE?

I have a few friends who work at PSU like HPCL and here are their insights on the job. 

Advantage: HPCL, IOCL, or any other PSU offer a huge sum. The work culture is very relaxing contrary to what you might have heard about corporations.

Disadvantage:

• It will get very monotonous. You will supervise but won't do any work. When you'll only have repeated tasks or nothing on your hands, then you realize that you're not growing here. Some of my friends have had only one year of substantial work in four-five years of their work experience.
• You will interact with the public a lot and they'll be mistrustful of you and your methodology because they associate knowledge and wisdom with grey hair. If you are joining in from top B-Schools and after handling intensive tasks in Core Companies, then this place will be full of joy.

Based on the interactions I had with my friends, I will say most people who leave PSU jobs are due to the monotonous work culture.