When identity politics took off in the 2016-2019 time frame, for Blacks, it was pretty easy to form a unified identity. Long removed from their African roots, common experience in slavery and Jim Crow, inner city struggles, police brutality, drugs, it was a common experience they could unify around, especially since polically too Blacks were already well established. Whites obviously divided themselves based on left/right wing political beliefs and you had subgroups like LGBTQ.
Asians though are newcomers to America. Yes rights groups say we've "been here since the 1800s" etc, but the vast majority of Asians in today's America are either 1st or 2nd generation. Even if don't know a lick of your native language and rejected all the traditions, you still were to some degree exposed to it at home, ie. your upbringing was not 100% American. So when identity politics took off, guess what? Most Asian Americans rather than coalescing around an Asian American identity, decided to retreat back to their roots. Because what is "Asian American identity?" About the only thing I could think of is a shared love for boba tea. So yeah, it doesn't exist.
When Eastern and Southern European immigrants were forced to assimilate into the Anglo identity, there was not much of a barrier since Anglo identity is still European. Asians will never be accepted into the Anglo identity and the Asian American identity is skin deep and perhaps more tragically never had/will never be allowed to develop, so every one just identifies based on ancestral country. And no surprise, in addition to relearning the languages, getting in touch with the motherland for some has meant adopting the current prejudices. So now you have American Born Koreans hating Chinese people, Indians hating Pakistanis, Vietnamese hating Cambodians, and everybody just looking down on Filipinos. Really, its a mess.