I am wondering that does every brand out there whose manufacturing android phones like HTC, Samsung, LG, Motorola etc has different list of their core processes like HTC has com.htc.launcher, Samsung has com.sec.android.app.samsung etc.
If yes then i have two questions.
Why they have different processes when default android processes are enough to perform necessary tasks.
You have no idea what "the necessary tasks" are, since you did not create those devices, since you are apparently not an employee at any of those firms.
Furthermore, equipment manufacturers have been developing software for their equipment, and shipping it with their equipment, since the invention of the computer. That was quite some time ago.
If you do not want these "different processes", you are welcome to build your own firmware, or use firmware from an existing third party, that runs on your phone.
Can some one provide me this lists of processes or give me a small idea about where to get these lists of processes
You are welcome to get a job at those firms where you can work on their devices and learn how they work.
its always good to know about this kind of stuff if you are in mobile development.
You are welcome to your opinion. I do not share it.