tradition
I am breaking with tradition this year by not eating turkey on Thanksgiving Day.
Last year the restaurant broke with tradition and opened to serve breakfasts.
I don't think you should automatically reject the proposal just because it breaks with tradition.

SMART Vocabulary: related words and phrases

Stop having or doing something
abdicate
abdication
bandh
bomb
bomb out
break with something
butt
forfeitable
forgo
forsake
forswear
give up
give up the ghostidiom
lay
self-denying
self-denyingly
self-renouncing
self-renunciation
self-sacrifice
throw

break with tradition | American Dictionary

break with tradition

idiom
to do something different from what is usually done:
We decided to break with tradition and have fish for Thanksgiving dinner.