CC0's biggest issues for me are that, one, it explicitly does not waive rights to patentable ideas contained in the work:
> No trademark or patent rights held by Affirmer are waived, abandoned, surrendered, licensed or otherwise affected by this document.
...and two, that it only specifically says that I will not revoke the license or undertake "any other legal or equitable action to disrupt the quiet enjoyment of the Work by the public". I don't just want to enable "quiet enjoyment", I want to permit every legally permissible use of my work (anything I could grant a license for). "Vocal profiteering" is arguably not "quiet enjoyment", but I want to ensure that neither me, my representatives, nor my heirs or successors, could make that argument to revoke the license I grant.
The Blue Oak license nicely disburses patent rights:
> Each contributor licenses you to do everything with this software that would otherwise infringe any patent claims they can license or become able to license.
...but expressly retains copyright (preventing someone else from redistributing the work under different terms), and requires that the work always be distributed with a notice that the work is licensed https://blueoakcouncil.org/license/1.0.0
I wish to completely unburden anyone who finds my work desirable from the burden of attribution. This is why Public Domain is the end goal, and why licenses that do not expressly attempt to un-copyright my work are insufficient. MIT0 merely grants permission "to deal in the Software [to say nothing about non-software work, or aspects of a work] without restriction", and 0BSD is even weaker, granting only "permission to use, copy, modify, and/or distribute this software for any purpose with or without fee" [nevermind any activities that aren't expressly listed in the license, but which might be restricted by a country's system of copy-, artists', or moral rights, or any other restrictions I may impose besides fees].