Observation about Assam

There are 7 states in North East India. I got a cultural shock when I went to every state except Assam. Assam just feels like West Bengal or UP. I did not find much cultural/economic/social/political differences in the state. Infact I found it similar to North India. Every other state in North East is super unique and has a unique perspective. Eg. Arunachal, Mizoram, Nagaland etc are all unique. Why doesn't Assam feel any different?