Who has ever heard of systemd-sysext?
https://manpages.debian.org/bookworm/systemd/systemd-sysext.8.en.html
The primary use case for system images are immutable environments where debugging and development tools shall optionally be made available, but not included in the immutable base OS image itself.
If TrueNAS were to support this we may not need feature requests for individual tools or commands.
Which would relate this topic to Decide and document where to install tools and scripts.