A sufficiently advanced user can still install something like LADB or shizuku or even a custom rom. This is extremely unnecessary to be a bundled OS permission.
> A sufficiently advanced user can still install something like LADB or shizuku or even a custom rom
Not without unlocking the bootloader (which can only be done on a few phones nowadays) and having to deal with getting locked out of a bunch of apps and functionalities as a result of Google's "security".