Emphasis on Tikkun Olam in reform Ashkenazi vs Mizrahi/Sephardic culture…

I’m not sure if this is because I am not observant, but as a Mizrahi Jew I’ve really only heard about the concept of Tikkun Olam from my reform Ashkenazi American friends. I’ve heard it described by some as a core tenet of Judaism, which… I find hard to believe?

I’m curious — is Tikkun Olam really that central of a concept in Judaism? Or has it become emphasized within the reform movement (which majority of Mizrahi/Sephardic Jews would not fall under)? If so, why?