Wasn't this the case for a long time? Since they started deduplicating the root partition and making it read-only/ a pain to write to?
Edit: https://github.com/Universal-Debloater-Alliance/universal-android-debloater-next-generation/wiki/FAQ
Tldr: You couldn't uninstall from /system, only from /data and now you can only disable them. Looking at the wiki also shows that there's not much difference between a data-only uninstalled system app and a data-only disabled app.
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