Not even gonna focus on the ethical argument against it, Imma just focus on the emotional pushback that the "ACL/ADOS" divide sparks.
Regardless of the misconceptions that people push on the internet, Majority of non-ADOS immigrants/first generations live in or lived in lower income majority black areas AKA "the hood". So from a young age, Afram people and their culture is what we were exposed to and brought into.
Hell, my youngest memory of race being a thing was in Kindergarten, where me and the other black boys (all American) had a little clique and we got a new kid who was a black Cuban named Ricardo. Thinking he "was black like us" I befriended Ricardo and introduced him to the rest of my friends, and they quickly let me know "he wasn't like us" and rejected him (I'm guessing his hair texture was the disqualifier).
Point is, at a young age I didn't know there was any difference between me, a Nigerian boy, and my American black friends. And even them being "race-aware" at a young age didn't register me being different, or at least not enough to consider me not part of their in-group. So from that point 5 year old me is like "yea, I'm a black boy", that's the first identity me and most immigrant kids ever form, no different than an American black kid.
Most NON-ADOS kids don't become aware of their immigrant identity until around ages 10-14. Me, I was aware a little younger because my half American big brother would always stress "I'm not African, I'm black! Y'all are African!" But 10-14 is usually the age where your parents try to start instilling in you "You're not black, you're (insert immigrant identity)." And if you're unlucky, even the black kids that you grew up with will start to treat you a little different. So you know you're different, but that point you're so entrenched in your first identity as a "black kid" you don't want to let it go, to the point you'll go against your parents and family to hold on to it.
Your parents and family constantly told you "you're not the same as them/they don't really like you/eventually they're gonna reject or harm you, just wait" in hopes that you will accept your immigrant identity as your primary identity, but you're stomp down in the idea that you and American blacks are the same ingroup....
Then one day you aren't, somebody tells you in so many words "yea, you have the same skin color as us, lived in the same situation as us, struggled just like us, experienced racism just like us... but you're not like US"
You feel hurt and betrayed, because that identity that meant the most to you, the first identity you ever formed. You went against your family and culture to hold on to that identity. Then you feel stupid because your parents, aunts, uncles told you this was gonna happen and you didn't listen. This happens to a lot of immigrant kids, but the ADOS wave feels like that on a macro level.
The people that aren't really hurt by it are the ones that stopped holding their "Black American" identity as their primary identity before it came. You don't have to drop it completely, but I transitioned from "I'm from Southwest Houston" to "I'm from Igbo Ukwu, Anambra State by way of Southwest Houston" years ago. My Nigerian/Igbo identity holds just as much weight as, if not a little more, as my identity as a "black American".
But for somebody that hasn't gone through the process of embracing their immigrant identity, and still primarily identifies as a "black American", it feels like you're trying to strip them of the main identity they have and value.
Also, keep in mind I'm from Southwest Houston, which has the highest concentration of Nigerians in the world outside of Nigeria. So even when you felt rejected by American blacks, you found reprieve in the fact their were enough Nigerian and African kids/people around for you to bond to a new group pretty easily.
But if you live in an area that doesn't have a lot of non-ADOS blacks, your pain is probably gonna be worst because it's not like you can just go hang with the Hispanics, Asians, White people (well a lot of immigrants will try to join another non-black group if they can't find a black group to fall in with, people long to belong to an ingroup. But usually in non-black groups they'll be even quicker to let you know you're not like them).
Ados is more than just a separate identity. Imo, it is the better option.
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