I think that DEI bringing to light the lack of racial, gender and ability diversity that is pervasive throughout corporate America is a huge success. That "DEI" and "pronouns" is "banned" in certain states is huge forward progress, even though it doesn't seem that way right now.
It got people thinking about this that would not have. That is how generational change starts.
For example, Basic civil rights for women and people historically discriminated against took decades to happen. Some states removed interracial marriage laws relatively recently (90s/00s), for example, despite interracial relationships existing since forever!
It took years for big OSS projects to rename their "master" trunk branches to "main." Nowadays, "master" branches look outdated and odd, and many big projects have diversity as a line item in their codes of conduct.